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/config.py

@@ -0,0 +1,69 @@
+import os
+from pathlib import Path
+from typing import Optional
+from dataclasses import dataclass
+from pydantic import BaseModel
+
+
+@dataclass
+class DatabaseConfig:
+    url: str = "sqlite:///./data/alert_platform.db"
+
+
+@dataclass
+class OSSConfig:
+    access_key_id: str = ""
+    access_key_secret: str = ""
+    endpoint: str = "oss-cn-hangzhou.aliyuncs.com"
+    bucket_name: str = ""
+    url_prefix: str = ""
+
+
+@dataclass
+class AppConfig:
+    host: str = "0.0.0.0"
+    port: int = 8000
+    debug: bool = True
+
+
+@dataclass
+class AIModelConfig:
+    endpoint: str = ""
+    api_key: str = ""
+
+
+class Settings(BaseModel):
+    database: DatabaseConfig = DatabaseConfig()
+    oss: OSSConfig = OSSConfig()
+    app: AppConfig = AppConfig()
+    ai_model: AIModelConfig = AIModelConfig()
+
+
+def load_settings() -> Settings:
+    from dotenv import load_dotenv
+    load_dotenv()
+
+    return Settings(
+        database=DatabaseConfig(
+            url=os.getenv("DATABASE_URL", "sqlite:///./data/alert_platform.db"),
+        ),
+        oss=OSSConfig(
+            access_key_id=os.getenv("OSS_ACCESS_KEY_ID", ""),
+            access_key_secret=os.getenv("OSS_ACCESS_KEY_SECRET", ""),
+            endpoint=os.getenv("OSS_ENDPOINT", "oss-cn-hangzhou.aliyuncs.com"),
+            bucket_name=os.getenv("OSS_BUCKET_NAME", ""),
+            url_prefix=os.getenv("OSS_URL_PREFIX", ""),
+        ),
+        app=AppConfig(
+            host=os.getenv("APP_HOST", "0.0.0.0"),
+            port=int(os.getenv("APP_PORT", "8000")),
+            debug=os.getenv("DEBUG", "true").lower() == "true",
+        ),
+        ai_model=AIModelConfig(
+            endpoint=os.getenv("AI_MODEL_ENDPOINT", ""),
+            api_key=os.getenv("AI_MODEL_API_KEY", ""),
+        ),
+    )
+
+
+settings = load_settings()