refactor:일반전표 상태(status) 열 제거, 기본상태를 confirmed로 변경

- 프론트엔드: 전표목록 테이블에서 상태 컬럼/필터/통계 제거
- 프론트엔드: 임시저장/확정 stat cards를 차변합계/대변합계로 교체
- 백엔드: store(), storeFromBank() 기본 status를 draft→confirmed 변경
- 백엔드: index() 통계에서 draftCount/confirmedCount 제거

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

app/Http/Controllers/Finance/JournalEntryController.php

@@ -77,8 +77,6 @@ public function index(Request $request): JsonResponse
             'totalCount' => $entries->count(),
             'totalDebit' => $entries->sum('total_debit'),
             'totalCredit' => $entries->sum('total_credit'),
-            'draftCount' => $entries->where('status', 'draft')->count(),
-            'confirmedCount' => $entries->where('status', 'confirmed')->count(),
         ];
 
         return response()->json([
@@ -174,7 +172,7 @@ public function store(Request $request): JsonResponse
                     'description' => $request->description,
                     'total_debit' => $totalDebit,
                     'total_credit' => $totalCredit,
-                    'status' => 'draft',
+                    'status' => 'confirmed',
                     'created_by_name' => auth()->user()?->name ?? '시스템',
                     'attachment_note' => $request->attachment_note,
                 ]);
@@ -487,7 +485,7 @@ public function storeFromBank(Request $request): JsonResponse
                     'description' => $request->description,
                     'total_debit' => $totalDebit,
                     'total_credit' => $totalCredit,
-                    'status' => 'draft',
+                    'status' => 'confirmed',
                     'source_type' => 'bank_transaction',
                     'source_key' => $request->source_key,
                     'created_by_name' => auth()->user()?->name ?? '시스템',