Build lightweight AI agent admin

backend-fastapi/app/base_schema.py

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+from datetime import datetime
+from typing import Annotated, Generic, TypeVar, List, Optional
+
+from pydantic import BaseModel
+from pydantic.functional_serializers import PlainSerializer
+
+from app.timezone import APP_TIMEZONE
+
+T = TypeVar("T")
+
+
+def _format_datetime(v: datetime) -> str | None:
+    """将 datetime 转换为配置时区并格式化为字符串"""
+    if v is None:
+        return None
+    if v.tzinfo is not None:
+        v = v.astimezone(APP_TIMEZONE)
+    return v.strftime("%Y-%m-%d %H:%M:%S")
+
+
+CSTDatetime = Annotated[datetime, PlainSerializer(_format_datetime, return_type=str)]
+
+
+class PaginatedResponse(BaseModel, Generic[T]):
+    """通用分页响应模型"""
+    items: List[T]
+    total: int
+
+
+class ResponseModel(BaseModel):
+    """通用响应模型"""
+    message: str = "success"
+    data: Optional[dict | list] = None