feat: [상품관리] 카테고리별 최저 개발비/최저 구독료 설정 기능 추가

- 카테고리 관리에서 최저 개발비, 최저 구독료 설정 가능
- 상품 추가/수정 시 최저가 이하 입력 차단 (서버 검증)
- 상품 목록에 최저가 안내 배너 표시 (경고 아이콘)
- 상품 모달에서 실시간 최저가 미달 경고 표시 (빨간 테두리)

app/Http/Controllers/Sales/SalesProductController.php

@@ -68,6 +68,13 @@ public function store(Request $request): JsonResponse
             'is_required' => 'boolean',
         ]);
 
+        // 최저가 검증
+        $category = SalesProductCategory::findOrFail($validated['category_id']);
+        $minFeeErrors = $this->validateMinFees($category, $validated);
+        if ($minFeeErrors) {
+            return response()->json(['success' => false, 'message' => $minFeeErrors], 422);
+        }
+
         // 코드 중복 체크
         $exists = SalesProduct::where('category_id', $validated['category_id'])
             ->where('code', $validated['code'])
@@ -115,6 +122,14 @@ public function update(Request $request, int $id): JsonResponse
             'is_active' => 'boolean',
         ]);
 
+        // 최저가 검증
+        $category = $product->category;
+        $checkData = array_merge($product->toArray(), $validated);
+        $minFeeErrors = $this->validateMinFees($category, $checkData);
+        if ($minFeeErrors) {
+            return response()->json(['success' => false, 'message' => $minFeeErrors], 422);
+        }
+
         $product->update($validated);
 
         return response()->json([
@@ -224,6 +239,8 @@ public function updateCategory(Request $request, int $id): JsonResponse
             'name' => 'sometimes|string|max:100',
             'description' => 'nullable|string',
             'base_storage' => 'nullable|string|max:20',
+            'min_development_fee' => 'nullable|numeric|min:0',
+            'min_subscription_fee' => 'nullable|numeric|min:0',
             'is_active' => 'boolean',
         ]);
 
@@ -259,6 +276,30 @@ public function deleteCategory(int $id): JsonResponse
         ]);
     }
 
+    // ==================== 내부 헬퍼 ====================
+
+    /**
+     * 최저가 검증
+     */
+    private function validateMinFees(SalesProductCategory $category, array $data): ?string
+    {
+        $errors = [];
+
+        if ($category->min_development_fee > 0 && isset($data['registration_fee'])) {
+            if ($data['registration_fee'] < $category->min_development_fee) {
+                $errors[] = '개발비(할인가)는 최저 개발비 ₩'.number_format($category->min_development_fee).' 이상이어야 합니다.';
+            }
+        }
+
+        if ($category->min_subscription_fee > 0 && isset($data['subscription_fee'])) {
+            if ($data['subscription_fee'] < $category->min_subscription_fee) {
+                $errors[] = '월 구독료는 최저 구독료 ₩'.number_format($category->min_subscription_fee).' 이상이어야 합니다.';
+            }
+        }
+
+        return $errors ? implode(' ', $errors) : null;
+    }
+
     // ==================== API (영업 시나리오용) ====================
 
     /**

app/Models/Sales/SalesProductCategory.php

@@ -14,6 +14,8 @@
  * @property string $name
  * @property string|null $description
  * @property string $base_storage
+ * @property float $min_development_fee
+ * @property float $min_subscription_fee
  * @property int $display_order
  * @property bool $is_active
  */
@@ -22,6 +24,7 @@ class SalesProductCategory extends Model
     use SoftDeletes;
 
     protected $connection = 'codebridge';
+
     protected $table = 'sales_product_categories';
 
     protected $fillable = [
@@ -29,11 +32,15 @@ class SalesProductCategory extends Model
         'name',
         'description',
         'base_storage',
+        'min_development_fee',
+        'min_subscription_fee',
         'display_order',
         'is_active',
     ];
 
     protected $casts = [
+        'min_development_fee' => 'decimal:2',
+        'min_subscription_fee' => 'decimal:2',
         'display_order' => 'integer',
         'is_active' => 'boolean',
     ];

resources/views/sales/products/index.blade.php

@@ -67,6 +67,28 @@ class="inline-flex items-center gap-2 px-4 py-2 text-sm font-medium text-white b
                 </button>
             </div>
 
+            {{-- 최저가 안내 --}}
+            <template x-if="currentMinDevFee > 0 || currentMinSubFee > 0">
+                <div class="mb-4 p-3 bg-amber-50 border border-amber-200 rounded-lg">
+                    <div class="flex items-start gap-2">
+                        <svg class="w-5 h-5 text-amber-500 mt-0.5 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.082 16.5c-.77.833.192 2.5 1.732 2.5z" />
+                        </svg>
+                        <div class="text-sm">
+                            <p class="font-semibold text-amber-800">최저가 설정 (이 금액 이하로 절대 내릴 수 없습니다)</p>
+                            <div class="flex gap-4 mt-1 text-amber-700">
+                                <template x-if="currentMinDevFee > 0">
+                                    <span>최저 개발비: <strong x-text="'₩' + Number(currentMinDevFee).toLocaleString()"></strong></span>
+                                </template>
+                                <template x-if="currentMinSubFee > 0">
+                                    <span>최저 구독료: <strong x-text="'₩' + Number(currentMinSubFee).toLocaleString()"></strong></span>
+                                </template>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </template>
+
             {{-- 상품 카드 그리드 --}}
             <div id="product-list" class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
                 @include('sales.products.partials.product-list', ['category' => $currentCategory])
@@ -129,9 +151,17 @@ class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:rin
                                 <input type="text"
                                        :value="formatNumber(productForm.registration_fee)"
                                        x-on:input="productForm.registration_fee = parseNumber($event.target.value); $event.target.value = formatNumber(productForm.registration_fee)"
-                                       class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right bg-indigo-50"
+                                       :class="currentMinDevFee > 0 && productForm.registration_fee < currentMinDevFee ? 'border-red-400 ring-1 ring-red-400' : 'border-gray-300'"
+                                       class="w-full px-3 py-2 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right bg-indigo-50"
                                        placeholder="0" required>
-                                <p class="text-xs text-gray-500 mt-1">기본: 개발비의 25%</p>
+                                <p class="text-xs mt-1" :class="currentMinDevFee > 0 && productForm.registration_fee < currentMinDevFee ? 'text-red-500 font-medium' : 'text-gray-500'">
+                                    <template x-if="currentMinDevFee > 0 && productForm.registration_fee < currentMinDevFee">
+                                        <span>최저 개발비 ₩<span x-text="Number(currentMinDevFee).toLocaleString()"></span> 이상 필수</span>
+                                    </template>
+                                    <template x-if="!(currentMinDevFee > 0 && productForm.registration_fee < currentMinDevFee)">
+                                        <span>기본: 개발비의 25%</span>
+                                    </template>
+                                </p>
                             </div>
                         </div>
                         <div>
@@ -139,8 +169,12 @@ class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:rin
                             <input type="text"
                                    :value="formatNumber(productForm.subscription_fee)"
                                    x-on:input="productForm.subscription_fee = parseNumber($event.target.value); $event.target.value = formatNumber(productForm.subscription_fee)"
-                                   class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right"
+                                   :class="currentMinSubFee > 0 && productForm.subscription_fee < currentMinSubFee ? 'border-red-400 ring-1 ring-red-400' : 'border-gray-300'"
+                                   class="w-full px-3 py-2 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right"
                                    placeholder="0" required>
+                            <template x-if="currentMinSubFee > 0 && productForm.subscription_fee < currentMinSubFee">
+                                <p class="text-xs text-red-500 font-medium mt-1">최저 구독료 ₩<span x-text="Number(currentMinSubFee).toLocaleString()"></span> 이상 필수</p>
+                            </template>
                         </div>
                         <div class="grid grid-cols-2 gap-4">
                             <div>
@@ -184,6 +218,72 @@ class="px-4 py-2 text-sm font-medium text-white bg-indigo-600 rounded-lg hover:b
         </div>
     </div>
 
+    {{-- 최저가 설정 모달 --}}
+    <div x-show="showMinFeeModal"
+         x-cloak
+         class="fixed inset-0 z-50 overflow-y-auto"
+         x-transition:enter="transition ease-out duration-300"
+         x-transition:enter-start="opacity-0"
+         x-transition:enter-end="opacity-100"
+         x-transition:leave="transition ease-in duration-200"
+         x-transition:leave-start="opacity-100"
+         x-transition:leave-end="opacity-0">
+        <div class="fixed inset-0 bg-gray-900/60 backdrop-blur-sm"></div>
+        <div class="min-h-screen px-4 flex items-center justify-center relative">
+            <div class="bg-white rounded-xl shadow-xl w-full max-w-md p-6 relative">
+                <button type="button" x-on:click="showMinFeeModal = false"
+                        class="absolute top-4 right-4 text-gray-400 hover:text-gray-600">
+                    <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+                    </svg>
+                </button>
+                <h3 class="text-lg font-bold text-gray-900 mb-1">최저가 설정</h3>
+                <p class="text-sm text-gray-500 mb-4" x-text="minFeeForm.categoryName"></p>
+
+                <div class="p-3 bg-red-50 border border-red-200 rounded-lg mb-4">
+                    <div class="flex items-start gap-2">
+                        <svg class="w-5 h-5 text-red-500 mt-0.5 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.082 16.5c-.77.833.192 2.5 1.732 2.5z" />
+                        </svg>
+                        <p class="text-sm text-red-700">설정된 최저가 이하로는 <strong>절대</strong> 상품 가격을 내릴 수 없습니다. 영업 할인 협상 시에도 이 금액이 하한선이 됩니다.</p>
+                    </div>
+                </div>
+
+                <div class="space-y-4">
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">최저 개발비 (할인가 기준)</label>
+                        <input type="text"
+                               :value="formatNumber(minFeeForm.min_development_fee)"
+                               x-on:input="minFeeForm.min_development_fee = parseNumber($event.target.value); $event.target.value = formatNumber(minFeeForm.min_development_fee)"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right"
+                               placeholder="0">
+                        <p class="text-xs text-gray-500 mt-1">0 입력 시 제한 없음</p>
+                    </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">최저 구독료 (월)</label>
+                        <input type="text"
+                               :value="formatNumber(minFeeForm.min_subscription_fee)"
+                               x-on:input="minFeeForm.min_subscription_fee = parseNumber($event.target.value); $event.target.value = formatNumber(minFeeForm.min_subscription_fee)"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 text-right"
+                               placeholder="0">
+                        <p class="text-xs text-gray-500 mt-1">0 입력 시 제한 없음</p>
+                    </div>
+                </div>
+
+                <div class="flex justify-end gap-3 mt-6">
+                    <button type="button" x-on:click="showMinFeeModal = false"
+                            class="px-4 py-2 text-sm font-medium text-gray-700 bg-white border border-gray-300 rounded-lg hover:bg-gray-50">
+                        취소
+                    </button>
+                    <button type="button" x-on:click="saveMinFees()"
+                            class="px-4 py-2 text-sm font-medium text-white bg-indigo-600 rounded-lg hover:bg-indigo-700">
+                        저장
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+
     {{-- 카테고리 관리 모달 --}}
     <div x-show="showCategoryModal"
          x-cloak
@@ -201,14 +301,33 @@ class="fixed inset-0 z-50 overflow-y-auto"
                 <h3 class="text-lg font-bold text-gray-900 mb-4">카테고리 관리</h3>
                 <div class="space-y-3 mb-4">
                     @foreach($categories as $category)
-                        <div class="flex items-center justify-between p-3 bg-gray-50 rounded-lg">
-                            <div>
-                                <div class="font-medium text-gray-900">{{ $category->name }}</div>
-                                <div class="text-xs text-gray-500">{{ $category->code }} / {{ $category->base_storage }}</div>
-                            </div>
-                            <div class="flex items-center gap-2">
-                                <span class="text-xs text-gray-400">{{ $category->products->count() }}개 상품</span>
+                        <div class="p-3 bg-gray-50 rounded-lg">
+                            <div class="flex items-center justify-between">
+                                <div>
+                                    <div class="font-medium text-gray-900">{{ $category->name }}</div>
+                                    <div class="text-xs text-gray-500">{{ $category->code }} / {{ $category->base_storage }}</div>
+                                </div>
+                                <div class="flex items-center gap-2">
+                                    <span class="text-xs text-gray-400">{{ $category->products->count() }}개 상품</span>
+                                    <button type="button"
+                                            x-on:click="openMinFeeModal({{ $category->id }}, '{{ $category->name }}', {{ $category->min_development_fee }}, {{ $category->min_subscription_fee }})"
+                                            class="p-1 text-gray-400 hover:text-indigo-600 transition-colors" title="최저가 설정">
+                                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z" />
+                                        </svg>
+                                    </button>
+                                </div>
                             </div>
+                            @if($category->min_development_fee > 0 || $category->min_subscription_fee > 0)
+                                <div class="mt-2 pt-2 border-t border-gray-200 flex gap-4 text-xs text-amber-700">
+                                    @if($category->min_development_fee > 0)
+                                        <span>최저 개발비: ₩{{ number_format($category->min_development_fee) }}</span>
+                                    @endif
+                                    @if($category->min_subscription_fee > 0)
+                                        <span>최저 구독료: ₩{{ number_format($category->min_subscription_fee) }}</span>
+                                    @endif
+                                </div>
+                            @endif
                         </div>
                     @endforeach
                 </div>
@@ -243,12 +362,22 @@ function productManager() {
         currentCategory: '{{ $currentCategory?->code ?? '' }}',
         categoryName: '{{ $currentCategory?->name ?? '' }}',
         baseStorage: '{{ $currentCategory?->base_storage ?? '100GB' }}',
+        currentMinDevFee: {{ $currentCategory?->min_development_fee ?? 0 }},
+        currentMinSubFee: {{ $currentCategory?->min_subscription_fee ?? 0 }},
         categories: @json($categories),
 
         showProductModal: false,
         showCategoryModal: false,
+        showMinFeeModal: false,
         editingProduct: null,
 
+        minFeeForm: {
+            categoryId: null,
+            categoryName: '',
+            min_development_fee: 0,
+            min_subscription_fee: 0,
+        },
+
         productForm: {
             code: '',
             name: '',
@@ -273,6 +402,8 @@ function productManager() {
             if (cat) {
                 this.categoryName = cat.name;
                 this.baseStorage = cat.base_storage;
+                this.currentMinDevFee = Number(cat.min_development_fee) || 0;
+                this.currentMinSubFee = Number(cat.min_subscription_fee) || 0;
             }
             htmx.ajax('GET', '{{ route("sales.products.list") }}?category=' + code, {
                 target: '#product-list',
@@ -410,6 +541,54 @@ function productManager() {
             this.productForm.development_fee = fee;
             // 개발비 자동 계산 (개발비의 25%)
             this.productForm.registration_fee = Math.floor(fee * 0.25);
+        },
+
+        openMinFeeModal(categoryId, categoryName, minDevFee, minSubFee) {
+            this.minFeeForm = {
+                categoryId: categoryId,
+                categoryName: categoryName,
+                min_development_fee: Number(minDevFee) || 0,
+                min_subscription_fee: Number(minSubFee) || 0,
+            };
+            this.showMinFeeModal = true;
+        },
+
+        async saveMinFees() {
+            try {
+                const response = await fetch('{{ url("sales/products/categories") }}/' + this.minFeeForm.categoryId, {
+                    method: 'PUT',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'Accept': 'application/json',
+                        'X-CSRF-TOKEN': document.querySelector('meta[name=csrf-token]').content,
+                    },
+                    body: JSON.stringify({
+                        min_development_fee: this.minFeeForm.min_development_fee,
+                        min_subscription_fee: this.minFeeForm.min_subscription_fee,
+                    }),
+                });
+                const result = await response.json();
+                if (result.success) {
+                    this.showMinFeeModal = false;
+                    // 카테고리 데이터 갱신
+                    const cat = this.categories.find(c => c.id === this.minFeeForm.categoryId);
+                    if (cat) {
+                        cat.min_development_fee = this.minFeeForm.min_development_fee;
+                        cat.min_subscription_fee = this.minFeeForm.min_subscription_fee;
+                    }
+                    // 현재 선택된 카테고리면 상단 안내 갱신
+                    if (cat && cat.code === this.currentCategory) {
+                        this.currentMinDevFee = this.minFeeForm.min_development_fee;
+                        this.currentMinSubFee = this.minFeeForm.min_subscription_fee;
+                    }
+                    location.reload();
+                } else {
+                    alert(result.message || '저장에 실패했습니다.');
+                }
+            } catch (error) {
+                console.error(error);
+                alert('저장 중 오류가 발생했습니다.');
+            }
         }
     };
 }