feat: Add Complex (단지선택) filter to Carmodoo search

- Added complex_code parameter to search_cars method
- Added /api/carmodoo/complexes endpoint with list of Korean auto complexes
- Added Complex dropdown as first filter in admin Cars search
- Passes complex_code to Carmodoo API as c_danji parameter

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app/admin/cars/page.tsx

@@ -86,6 +86,7 @@ interface LocalCar {
 }
 
 interface SearchFilters {
+  complex_code: string;  // 단지 코드
   maker_code: string;
   model_code: string;
   grade: string;
@@ -99,6 +100,11 @@ interface SearchFilters {
   displacement_max: string;
 }
 
+interface CarmodooComplex {
+  code: string;
+  name: string;
+}
+
 const FUEL_TYPES = [
   { value: '', label: 'All' },
   { value: '가솔린', label: 'Gasoline' },
@@ -166,6 +172,7 @@ export default function CarsAdminPage() {
   const [totalCount, setTotalCount] = useState(0);
   const [currentPage, setCurrentPage] = useState(1);
   const [filters, setFilters] = useState<SearchFilters>({
+    complex_code: '',
     maker_code: '',
     model_code: '',
     grade: '',
@@ -178,6 +185,7 @@ export default function CarsAdminPage() {
     displacement_min: '',
     displacement_max: '',
   });
+  const [complexes, setComplexes] = useState<CarmodooComplex[]>([]);
   const [importResult, setImportResult] = useState<{
     imported: number;
     skipped: number;
@@ -585,8 +593,12 @@ export default function CarsAdminPage() {
 
   const loadInitialData = async () => {
     try {
-      const makersRes = await api.get('/carmodoo/makers');
+      const [makersRes, complexesRes] = await Promise.all([
+        api.get('/carmodoo/makers'),
+        api.get('/carmodoo/complexes'),
+      ]);
       setMakers(makersRes.data);
+      setComplexes(complexesRes.data);
     } catch (err) {
       console.error('Failed to load initial data:', err);
     }
@@ -623,6 +635,7 @@ export default function CarsAdminPage() {
     try {
       const params: Record<string, any> = { page, page_size: 20 };
 
+      if (filters.complex_code) params.complex_code = filters.complex_code;
       if (filters.maker_code) params.maker_code = filters.maker_code;
       if (filters.model_code) params.model_code = filters.model_code;
       if (filters.grade) params.grade = filters.grade;
@@ -1953,8 +1966,26 @@ export default function CarsAdminPage() {
           <div className="bg-white rounded-xl shadow-sm p-6 mb-6">
             <h2 className="text-lg font-semibold text-gray-800 mb-4">Search from Carmodoo</h2>
 
-            {/* First Row: Maker, Model, Car Type, Grade */}
+            {/* First Row: Complex, Maker, Model, Grade */}
             <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 mb-4">
+              {/* Complex (단지선택) */}
+              <div>
+                <label className="block text-sm font-medium text-gray-700 mb-1">
+                  Complex (단지선택)
+                </label>
+                <select
+                  value={filters.complex_code}
+                  onChange={(e) => handleFilterChange('complex_code', e.target.value)}
+                  className="w-full border border-gray-300 rounded-lg px-3 py-2 focus:ring-2 focus:ring-primary-500 focus:border-primary-500"
+                >
+                  {complexes.map((complex) => (
+                    <option key={complex.code} value={complex.code}>
+                      {complex.name}
+                    </option>
+                  ))}
+                </select>
+              </div>
+
               {/* Maker (제조사) */}
               <div>
                 <label className="block text-sm font-medium text-gray-700 mb-1">