fix: [stocks] 재고생산 품목추가 버튼 제거

- ItemAddDialog 모달이 수주용 형식이라 재고생산과 불일치
- 품목은 재고생산 저장 시 자동으로 추가되므로 수동 추가 불필요
- 관련 import, state, handler 정리

src/components/stocks/StockProductionForm.tsx

@@ -4,7 +4,7 @@
  * 재고생산 등록/수정 폼
  *
  * - 생산사유, 목표재고수량, 메모, 비고
- * - 품목 내역 (ItemAddDialog 사용)
+ * - 품목 내역 (자동 추가, 수동 추가 불가)
  * - IntegratedDetailTemplate + renderForm 패턴
  */
 
@@ -24,11 +24,11 @@ import {
   TableHeader,
   TableRow,
 } from '@/components/ui/table';
-import { Package, Plus, Trash2, MessageSquare, ClipboardList } from 'lucide-react';
+import { Package, Trash2, MessageSquare, ClipboardList } from 'lucide-react';
 import { toast } from 'sonner';
 import { IntegratedDetailTemplate } from '@/components/templates/IntegratedDetailTemplate';
 import { FormSection } from '@/components/organisms/FormSection';
-import { ItemAddDialog, type OrderItem } from '@/components/orders/ItemAddDialog';
+import type { OrderItem } from '@/components/orders/ItemAddDialog';
 import { formatAmount } from '@/lib/utils/amount';
 import {
   createStockOrder,
@@ -139,7 +139,6 @@ export function StockProductionForm({
     return INITIAL_FORM;
   });
 
-  const [isItemDialogOpen, setIsItemDialogOpen] = useState(false);
   const [fieldErrors, setFieldErrors] = useState<Record<string, string>>({});
 
   // 필드 에러 초기화
@@ -153,16 +152,6 @@ export function StockProductionForm({
     });
   }, []);
 
-  // 품목 추가
-  const handleAddItem = useCallback((item: OrderItem) => {
-    setForm((prev) => ({
-      ...prev,
-      items: [...prev.items, item],
-    }));
-    clearFieldError('items');
-    toast.success('품목이 추가되었습니다.');
-  }, [clearFieldError]);
-
   // 품목 삭제
   const handleRemoveItem = useCallback((itemId: string) => {
     setForm((prev) => ({
@@ -311,16 +300,6 @@ export function StockProductionForm({
           <FormSection
             title="품목 내역"
             icon={Package}
-            headerAction={
-              <Button
-                size="sm"
-                variant="outline"
-                onClick={() => setIsItemDialogOpen(true)}
-              >
-                <Plus className="h-4 w-4 mr-1" />
-                품목 추가
-              </Button>
-            }
           >
             {fieldErrors.items && (
               <p className="text-sm text-red-500 mb-3">{fieldErrors.items}</p>
@@ -329,16 +308,7 @@ export function StockProductionForm({
             {form.items.length === 0 ? (
               <div className="text-center py-12 text-muted-foreground">
                 <Package className="h-12 w-12 mx-auto mb-3 opacity-30" />
-                <p>품목을 추가해주세요</p>
-                <Button
-                  variant="outline"
-                  size="sm"
-                  className="mt-3"
-                  onClick={() => setIsItemDialogOpen(true)}
-                >
-                  <Plus className="h-4 w-4 mr-1" />
-                  품목 추가
-                </Button>
+                <p>품목이 없습니다. 재고생산 저장 시 자동으로 추가됩니다.</p>
               </div>
             ) : (
               <div className="overflow-x-auto">
@@ -403,21 +373,13 @@ export function StockProductionForm({
   );
 
   return (
-    <>
-      <IntegratedDetailTemplate
-        config={config}
-        mode={isEditMode ? 'edit' : 'create'}
-        isLoading={false}
-        onCancel={handleCancel}
-        onSubmit={() => handleSave()}
-        renderForm={renderFormContent}
-      />
-
-      <ItemAddDialog
-        open={isItemDialogOpen}
-        onOpenChange={setIsItemDialogOpen}
-        onAdd={handleAddItem}
-      />
-    </>
+    <IntegratedDetailTemplate
+      config={config}
+      mode={isEditMode ? 'edit' : 'create'}
+      isLoading={false}
+      onCancel={handleCancel}
+      onSubmit={() => handleSave()}
+      renderForm={renderFormContent}
+    />
   );
 }