♻️ refactor(files): adjust file schema import path

- update import location of FileSchema, CreateFileDto and UpdateFileDto from file.entity to file.schema
- maintain type safety while separating schema definitions from entity implementation

src/server/api/files/index.ts

@@ -9,7 +9,7 @@ import { AuthContext } from '@/server/types/context';
 
 import { createCrudRoutes } from '@/server/utils/generic-crud.routes';
 import { File } from '@/server/modules/files/file.entity';
-import { FileSchema, CreateFileDto, UpdateFileDto } from '@/server/modules/files/file.entity';
+import { FileSchema, CreateFileDto, UpdateFileDto } from '@/server/modules/files/file.schema';
 import { authMiddleware } from '@/server/middleware/auth.middleware';
 
 const fileRoutes = createCrudRoutes({