feat: 입찰(Bidding) 관리 기능 구현

- Bidding 모델, 서비스, 컨트롤러, FormRequest 추가
- 마이그레이션 및 시더 추가
- Swagger API 문서 추가
- 견적에서 입찰 전환 시 중복 체크 로직 추가
- per_page 파라미터 100 초과 시 자동 클램핑 처리
- error.bidding.already_registered 에러 메시지 추가

app/Http/Requests/Bidding/BiddingFilterRequest.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Requests\Bidding;
+
+use App\Models\Bidding\Bidding;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class BiddingFilterRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'status' => ['nullable', 'string', Rule::in(Bidding::STATUSES)],
+            'from_date' => ['nullable', 'date'],
+            'to_date' => ['nullable', 'date', 'after_or_equal:from_date'],
+            'search' => ['nullable', 'string', 'max:100'],
+            'sort_by' => ['nullable', 'string', Rule::in(['bidding_date', 'bidding_code', 'client_name', 'project_name', 'bidding_amount', 'status', 'created_at'])],
+            'sort_dir' => ['nullable', 'string', Rule::in(['asc', 'desc'])],
+            'per_page' => ['nullable', 'integer', 'min:1'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'status.in' => __('validation.in', ['attribute' => __('validation.attributes.status')]),
+            'to_date.after_or_equal' => __('validation.after_or_equal', ['attribute' => __('validation.attributes.to_date'), 'date' => __('validation.attributes.from_date')]),
+        ];
+    }
+}

app/Http/Requests/Bidding/BiddingStatusRequest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests\Bidding;
+
+use App\Models\Bidding\Bidding;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class BiddingStatusRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'status' => ['required', 'string', Rule::in(Bidding::STATUSES)],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'status.required' => __('validation.required', ['attribute' => __('validation.attributes.status')]),
+            'status.in' => __('validation.in', ['attribute' => __('validation.attributes.status')]),
+        ];
+    }
+}

app/Http/Requests/Bidding/BiddingStoreRequest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Http\Requests\Bidding;
+
+use App\Models\Bidding\Bidding;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class BiddingStoreRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            // 견적 연결 (선택사항)
+            'quote_id' => ['nullable', 'integer', 'exists:quotes,id'],
+            // 거래처/현장
+            'client_id' => ['nullable', 'integer'],
+            'client_name' => ['nullable', 'string', 'max:100'],
+            'project_name' => ['required', 'string', 'max:200'],
+            // 입찰 정보
+            'bidding_date' => ['nullable', 'date'],
+            'bid_date' => ['nullable', 'date'],
+            'submission_date' => ['nullable', 'date'],
+            'confirm_date' => ['nullable', 'date'],
+            'total_count' => ['nullable', 'integer', 'min:0'],
+            'bidding_amount' => ['nullable', 'numeric', 'min:0'],
+            // 상태 (기본값: waiting)
+            'status' => ['nullable', 'string', Rule::in(Bidding::STATUSES)],
+            // 입찰자
+            'bidder_id' => ['nullable', 'integer'],
+            'bidder_name' => ['nullable', 'string', 'max:50'],
+            // 공사기간
+            'construction_start_date' => ['nullable', 'date'],
+            'construction_end_date' => ['nullable', 'date', 'after_or_equal:construction_start_date'],
+            'vat_type' => ['nullable', 'string', Rule::in(Bidding::VAT_TYPES)],
+            // 비고
+            'remarks' => ['nullable', 'string'],
+            // 견적 데이터 스냅샷 (견적에서 전환 시)
+            'expense_items' => ['nullable', 'array'],
+            'estimate_detail_items' => ['nullable', 'array'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'project_name.required' => __('validation.required', ['attribute' => '현장명']),
+            'quote_id.exists' => __('validation.exists', ['attribute' => '견적']),
+        ];
+    }
+}

app/Http/Requests/Bidding/BiddingUpdateRequest.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Requests\Bidding;
+
+use App\Models\Bidding\Bidding;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class BiddingUpdateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            // 거래처/현장
+            'client_id' => ['nullable', 'integer'],
+            'client_name' => ['nullable', 'string', 'max:100'],
+            'project_name' => ['nullable', 'string', 'max:200'],
+            // 입찰 정보
+            'bidding_date' => ['nullable', 'date'],
+            'bid_date' => ['nullable', 'date'],
+            'submission_date' => ['nullable', 'date'],
+            'confirm_date' => ['nullable', 'date'],
+            'total_count' => ['nullable', 'integer', 'min:0'],
+            'bidding_amount' => ['nullable', 'numeric', 'min:0'],
+            // 상태
+            'status' => ['nullable', 'string', Rule::in(Bidding::STATUSES)],
+            // 입찰자
+            'bidder_id' => ['nullable', 'integer'],
+            'bidder_name' => ['nullable', 'string', 'max:50'],
+            // 공사기간
+            'construction_start_date' => ['nullable', 'date'],
+            'construction_end_date' => ['nullable', 'date', 'after_or_equal:construction_start_date'],
+            'vat_type' => ['nullable', 'string', Rule::in(Bidding::VAT_TYPES)],
+            // 비고
+            'remarks' => ['nullable', 'string'],
+            // 견적 데이터 스냅샷
+            'expense_items' => ['nullable', 'array'],
+            'estimate_detail_items' => ['nullable', 'array'],
+        ];
+    }
+}

app/Http/Requests/Bidding/BulkDeleteRequest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests\Bidding;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class BulkDeleteRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'ids' => ['required', 'array', 'min:1'],
+            'ids.*' => ['required', 'integer'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'ids.required' => __('validation.required', ['attribute' => 'ids']),
+            'ids.array' => __('validation.array', ['attribute' => 'ids']),
+            'ids.min' => __('validation.min.array', ['attribute' => 'ids', 'min' => 1]),
+        ];
+    }
+}