feat: [finance] 계정과목 확장 및 전표 연동 시스템 구현

- AccountCode 모델/서비스 확장 (업데이트, 기본 계정과목 시딩)
- JournalSyncService 추가 (전표 자동 연동)
- SyncsExpenseAccounts 트레이트 추가
- CardTransactionController, TaxInvoiceController 기능 확장
- expense_accounts 테이블에 전표 연결 컬럼 마이그레이션
- account_codes 테이블 확장 마이그레이션
- 전체 테넌트 기본 계정과목 시딩 마이그레이션

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/Api/V1/TaxInvoiceController.php

@@ -10,12 +10,17 @@
 use App\Http\Requests\TaxInvoice\TaxInvoiceSummaryRequest;
 use App\Http\Requests\TaxInvoice\UpdateTaxInvoiceRequest;
 use App\Http\Requests\V1\TaxInvoice\BulkIssueRequest;
+use App\Models\Tenants\JournalEntry;
+use App\Services\JournalSyncService;
 use App\Services\TaxInvoiceService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
 
 class TaxInvoiceController extends Controller
 {
     public function __construct(
-        private TaxInvoiceService $taxInvoiceService
+        private TaxInvoiceService $taxInvoiceService,
+        private JournalSyncService $journalSyncService,
     ) {}
 
     /**
@@ -148,4 +153,75 @@ public function summary(TaxInvoiceSummaryRequest $request)
             message: __('message.fetched')
         );
     }
+
+    // =========================================================================
+    // 분개 (Journal Entries)
+    // =========================================================================
+
+    /**
+     * 세금계산서 분개 조회
+     */
+    public function getJournalEntries(int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id) {
+            $sourceKey = "tax_invoice_{$id}";
+            $data = $this->journalSyncService->getForSource(
+                JournalEntry::SOURCE_TAX_INVOICE,
+                $sourceKey
+            );
+
+            return $data ?? ['rows' => []];
+        }, __('message.fetched'));
+    }
+
+    /**
+     * 세금계산서 분개 저장/수정
+     */
+    public function storeJournalEntries(Request $request, int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request, $id) {
+            $validated = $request->validate([
+                'rows' => 'required|array|min:1',
+                'rows.*.side' => 'required|in:debit,credit',
+                'rows.*.account_subject' => 'required|string|max:20',
+                'rows.*.debit_amount' => 'required|integer|min:0',
+                'rows.*.credit_amount' => 'required|integer|min:0',
+            ]);
+
+            // 세금계산서 정보 조회 (entry_date용)
+            $taxInvoice = $this->taxInvoiceService->show($id);
+
+            $rows = array_map(fn ($row) => [
+                'side' => $row['side'],
+                'account_code' => $row['account_subject'],
+                'debit_amount' => $row['debit_amount'],
+                'credit_amount' => $row['credit_amount'],
+            ], $validated['rows']);
+
+            $sourceKey = "tax_invoice_{$id}";
+
+            return $this->journalSyncService->saveForSource(
+                JournalEntry::SOURCE_TAX_INVOICE,
+                $sourceKey,
+                $taxInvoice->issue_date?->format('Y-m-d') ?? now()->format('Y-m-d'),
+                "세금계산서 분개 (#{$id})",
+                $rows,
+            );
+        }, __('message.created'));
+    }
+
+    /**
+     * 세금계산서 분개 삭제
+     */
+    public function deleteJournalEntries(int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id) {
+            $sourceKey = "tax_invoice_{$id}";
+
+            return $this->journalSyncService->deleteForSource(
+                JournalEntry::SOURCE_TAX_INVOICE,
+                $sourceKey
+            );
+        }, __('message.deleted'));
+    }
 }