feat: 初始化告警平台后端项目

- 创建 FastAPI 项目结构
- 实现告警数据模型（SQLAlchemy）
- 实现 multipart/form-data 告警接收接口
- 实现阿里云 OSS 图片上传模块
- 实现告警查询和处理 API
- 实现异步大模型分析模块

app/schemas.py

@@ -0,0 +1,66 @@
+import os
+from pydantic import BaseModel, Field
+from typing import Optional, List
+from datetime import datetime
+
+
+class AlertCreate(BaseModel):
+    camera_id: str = Field(..., description="摄像头标识")
+    roi_id: Optional[str] = Field(None, description="ROI区域标识")
+    alert_type: str = Field(..., description="告警类型")
+    algorithm: Optional[str] = Field(None, description="算法名称")
+    confidence: Optional[int] = Field(None, ge=0, le=100, description="置信度")
+    duration_minutes: Optional[int] = Field(None, ge=0, description="离岗时长(分钟)")
+    trigger_time: datetime = Field(..., description="触发时间")
+    message: Optional[str] = Field(None, description="告警消息")
+
+
+class AlertResponse(BaseModel):
+    id: int
+    alert_no: str
+    camera_id: str
+    roi_id: Optional[str]
+    alert_type: str
+    algorithm: Optional[str]
+    confidence: Optional[int]
+    duration_minutes: Optional[int]
+    trigger_time: Optional[str]
+    message: Optional[str]
+    snapshot_url: Optional[str]
+    status: str
+    handle_remark: Optional[str]
+    handled_by: Optional[str]
+    handled_at: Optional[str]
+    ai_analysis: Optional[dict]
+    created_at: Optional[str]
+    updated_at: Optional[str]
+
+    class Config:
+        from_attributes = True
+
+
+class AlertListResponse(BaseModel):
+    alerts: List[AlertResponse]
+    total: int
+    page: int
+    page_size: int
+
+
+class AlertHandleRequest(BaseModel):
+    status: str = Field(..., description="处理状态: confirmed/ignored/resolved")
+    remark: Optional[str] = Field(None, description="处理备注")
+
+
+class AlertStatisticsResponse(BaseModel):
+    total: int
+    pending: int
+    confirmed: int
+    ignored: int
+    resolved: int
+    by_type: dict
+    by_level: dict
+
+
+class HealthResponse(BaseModel):
+    status: str
+    database: str