feat(m10): file sharing with upload, lightbox, permission, tests, e2e

- FileRepository (CRUD, soft-delete, pagination, project isolation) +
  FileStorageService (local FS save data/uploads/<projectId>/<uuid>.<ext>,
  MIME allowlist, filename sanitize, unique uuid name, member permission,
  file_shared notification to other members, file_uploaded activity log,
  SSE file.uploaded, uploader/admin delete + FS unlink)
- APIs: files list/upload(multipart), download (membership), delete
- Screens: files page + Uploader(multipart) + FileList(image Lightbox,
  PDF link, delete), ProjectNav ファイル link
- Unit tests (FileRepository, FileStorageService) + e2e file-sharing

lib/api/services.ts

@@ -16,6 +16,8 @@ import { ChatRepository } from '@/repositories/ChatRepository';
 import { getSseHub } from '@/lib/sse/hub';
 import { TodoService } from '@/services/TodoService';
 import { TodoRepository } from '@/repositories/TodoRepository';
+import { FileStorageService } from '@/services/FileStorageService';
+import { FileRepository } from '@/repositories/FileRepository';
 
 /**
  * Route Handler用に各Repository/Serviceを構築するファクトリ。
@@ -81,6 +83,19 @@ export function createTodoService(): TodoService {
   );
 }
 
+export function createFileStorageService(): FileStorageService {
+  const db = getDb();
+  const uploadsDir = process.env.UPLOADS_PATH ?? './data/uploads';
+  return new FileStorageService(
+    new FileRepository(db),
+    new ProjectMemberRepository(db),
+    new NotificationService(new NotificationRepository(db)),
+    new ActivityLogService(new ActivityLogRepository(db)),
+    getSseHub(),
+    uploadsDir
+  );
+}
+
 export function createUserRepository(): UserRepository {
   return new UserRepository(getDb());
 }