feat: 初始化考培练系统项目

- 从服务器拉取完整代码
- 按框架规范整理项目结构
- 配置 Drone CI 测试环境部署
- 包含后端(FastAPI)、前端(Vue3)、管理端

技术栈: Vue3 + TypeScript + FastAPI + MySQL

backend/app/schemas/base.py

@@ -0,0 +1,73 @@
+"""基础响应模式"""
+from typing import Generic, TypeVar, Optional, Any, List
+from pydantic import BaseModel, Field
+from datetime import datetime
+
+DataT = TypeVar("DataT")
+
+
+class ResponseModel(BaseModel, Generic[DataT]):
+    """
+    统一响应格式模型
+    """
+
+    code: int = Field(default=200, description="响应状态码")
+    message: str = Field(default="success", description="响应消息")
+    data: Optional[DataT] = Field(default=None, description="响应数据")
+    request_id: Optional[str] = Field(default=None, description="请求ID")
+
+
+class BaseSchema(BaseModel):
+    """基础模式"""
+
+    class Config:
+        from_attributes = True  # Pydantic V2
+        json_encoders = {datetime: lambda v: v.isoformat()}
+
+
+class TimestampMixin(BaseModel):
+    """时间戳混入"""
+
+    created_at: datetime
+    updated_at: datetime
+
+
+class IDMixin(BaseModel):
+    """ID混入"""
+
+    id: int
+
+
+class PaginationParams(BaseModel):
+    """分页参数"""
+
+    page: int = Field(default=1, ge=1, description="页码")
+    page_size: int = Field(default=20, ge=1, le=100, description="每页数量")
+
+    @property
+    def offset(self) -> int:
+        """计算偏移量"""
+        return (self.page - 1) * self.page_size
+
+    @property
+    def limit(self) -> int:
+        """计算限制数量"""
+        return self.page_size
+
+
+class PaginatedResponse(BaseModel, Generic[DataT]):
+    """分页响应模型"""
+
+    items: list[DataT] = Field(default_factory=list, description="数据列表")
+    total: int = Field(default=0, description="总数量")
+    page: int = Field(default=1, description="当前页码")
+    page_size: int = Field(default=20, description="每页数量")
+    pages: int = Field(default=1, description="总页数")
+
+    @classmethod
+    def create(cls, items: list[DataT], total: int, page: int, page_size: int):
+        """创建分页响应"""
+        pages = (total + page_size - 1) // page_size if page_size > 0 else 1
+        return cls(
+            items=items, total=total, page=page, page_size=page_size, pages=pages
+        )