feat: [daily-work-log] 메모/회고 파일 업로드 기능 추가

- 메모, 회고 섹션에 파일 첨부 기능 추가
- 드래그앤드롭 및 클릭 업로드 지원
- 이미지 썸네일 미리보기, 파일 다운로드/삭제
- Boards\File 모델 재사용 (document_type: daily_work_log)

app/Http/Controllers/Finance/DailyWorkLogController.php

@@ -3,10 +3,13 @@
 namespace App\Http\Controllers\Finance;
 
 use App\Http\Controllers\Controller;
+use App\Models\Boards\File;
 use App\Models\Finance\DailyWorkLog;
 use App\Models\Finance\DailyWorkLogItem;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Str;
 
 class DailyWorkLogController extends Controller
 {
@@ -41,6 +44,21 @@ public function show(Request $request): JsonResponse
         $total = $items->count();
         $completed = $items->where('is_completed', true)->count();
 
+        $files = File::where('document_type', 'daily_work_log')
+            ->where('document_id', $log->id)
+            ->whereNull('deleted_at')
+            ->get()
+            ->map(fn (File $f) => [
+                'id' => $f->id,
+                'field_key' => $f->field_key,
+                'original_name' => $f->original_name,
+                'file_size' => $f->file_size,
+                'formatted_size' => $f->getFormattedSize(),
+                'mime_type' => $f->mime_type,
+                'is_image' => $f->isImage(),
+                'url' => $f->getUrl(),
+            ]);
+
         return response()->json([
             'success' => true,
             'data' => [
@@ -50,6 +68,7 @@ public function show(Request $request): JsonResponse
                 'reflection' => $log->reflection ?? '',
                 'items' => $items->values(),
                 'achievement_rate' => $total > 0 ? round(($completed / $total) * 100, 2) : 0,
+                'files' => $files->values(),
             ],
         ]);
     }
@@ -173,4 +192,101 @@ public function copyFromPrevious(Request $request): JsonResponse
             ],
         ]);
     }
+
+    /**
+     * 파일 업로드 (메모/회고 첨부)
+     */
+    public function uploadFile(Request $request): JsonResponse
+    {
+        $request->validate([
+            'log_date' => 'required|date',
+            'field_key' => 'required|in:memo,reflection',
+            'file' => 'required|file|max:10240',
+        ]);
+
+        $tenantId = session('selected_tenant_id', 1);
+
+        $log = DailyWorkLog::updateOrCreate(
+            ['tenant_id' => $tenantId, 'log_date' => $request->input('log_date')],
+            ['created_by' => auth()->id()]
+        );
+
+        $file = $request->file('file');
+        $storedName = Str::uuid().'.'.$file->getClientOriginalExtension();
+        $basePath = "daily-work-log/{$tenantId}/{$log->id}";
+        $filePath = "{$basePath}/{$storedName}";
+
+        Storage::disk('tenant')->put($filePath, file_get_contents($file));
+
+        $record = File::create([
+            'tenant_id' => $tenantId,
+            'is_temp' => false,
+            'file_path' => $filePath,
+            'display_name' => $file->getClientOriginalName(),
+            'stored_name' => $storedName,
+            'original_name' => $file->getClientOriginalName(),
+            'file_name' => $file->getClientOriginalName(),
+            'file_size' => $file->getSize(),
+            'mime_type' => $file->getMimeType(),
+            'file_type' => $this->detectFileType($file->getMimeType()),
+            'field_key' => $request->input('field_key'),
+            'document_type' => 'daily_work_log',
+            'document_id' => $log->id,
+            'uploaded_by' => auth()->id(),
+            'created_by' => auth()->id(),
+        ]);
+
+        return response()->json([
+            'success' => true,
+            'file' => [
+                'id' => $record->id,
+                'field_key' => $record->field_key,
+                'original_name' => $record->original_name,
+                'file_size' => $record->file_size,
+                'formatted_size' => $record->getFormattedSize(),
+                'mime_type' => $record->mime_type,
+                'is_image' => $record->isImage(),
+                'url' => $record->getUrl(),
+            ],
+        ]);
+    }
+
+    /**
+     * 파일 삭제
+     */
+    public function deleteFile(int $fileId): JsonResponse
+    {
+        $file = File::where('document_type', 'daily_work_log')->findOrFail($fileId);
+        $file->softDeleteFile(auth()->id());
+
+        return response()->json(['success' => true]);
+    }
+
+    /**
+     * 파일 다운로드
+     */
+    public function downloadFile(int $fileId)
+    {
+        $file = File::where('document_type', 'daily_work_log')->findOrFail($fileId);
+
+        return $file->download();
+    }
+
+    private function detectFileType(?string $mimeType): string
+    {
+        if (! $mimeType) {
+            return 'other';
+        }
+        if (str_starts_with($mimeType, 'image/')) {
+            return 'image';
+        }
+        if ($mimeType === 'application/pdf') {
+            return 'pdf';
+        }
+        if (str_contains($mimeType, 'spreadsheet') || str_contains($mimeType, 'excel')) {
+            return 'excel';
+        }
+
+        return 'document';
+    }
 }