费用管理内容优化-初步

backend/app/schemas/fee_attachment.py

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+import uuid
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict
+
+from app.schemas.user import UserDisplay
+
+
+class FeeAttachmentRead(BaseModel):
+    id: uuid.UUID
+    entity_type: str
+    entity_id: uuid.UUID
+    file_type: str
+    filename: str
+    mime_type: Optional[str]
+    size: int
+    storage_key: Optional[str]
+    url: Optional[str]
+    uploaded_by: Optional[UserDisplay]
+    uploaded_by_id: Optional[uuid.UUID] = None
+    uploaded_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)