feat(T05): Dateiablage pro Fahrzeug + File UI with thumbnails and gallery

backend/app/schemas/file.py

@@ -0,0 +1,57 @@
+"""Pydantic schemas for file upload, download, and list responses."""
+
+import uuid
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+
+class FileUploadResponse(BaseModel):
+    """Response after a successful file upload."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    vehicle_id: uuid.UUID
+    original_filename: str
+    stored_filename: str
+    file_path: str
+    mime_type: str
+    file_size: int
+    thumbnail_path: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class FileResponse(BaseModel):
+    """Full file metadata response."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    vehicle_id: uuid.UUID
+    original_filename: str
+    stored_filename: str
+    file_path: str
+    mime_type: str
+    file_size: int
+    thumbnail_path: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class FileListResponse(BaseModel):
+    """Paginated file list response."""
+
+    items: list[FileResponse]
+    total: int
+    page: int
+    page_size: int
+
+
+class FileDeleteResponse(BaseModel):
+    """Response after deleting a file."""
+
+    message: str = "File deleted"
+    id: uuid.UUID