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/services/oss_storage.py

@@ -0,0 +1,79 @@
+import uuid
+from datetime import datetime, timezone
+from typing import Optional
+
+import oss2
+
+from app.config import settings
+from app.utils.logger import logger
+
+
+class OSSStorage:
+    def __init__(self):
+        self.bucket = None
+        self._init_bucket()
+
+    def _init_bucket(self):
+        if not settings.oss.access_key_id or not settings.oss.bucket_name:
+            logger.warning("OSS配置不完整，将使用本地存储")
+            return
+
+        try:
+            auth = oss2.Auth(settings.oss.access_key_id, settings.oss.access_key_secret)
+            self.bucket = oss2.Bucket(auth, settings.oss.endpoint, settings.oss.bucket_name)
+            logger.info(f"OSS连接成功: {settings.oss.bucket_name}")
+        except Exception as e:
+            logger.error(f"OSS连接失败: {e}")
+            self.bucket = None
+
+    def upload_image(self, image_data: bytes, filename: Optional[str] = None) -> str:
+        if not self.bucket:
+            return self._upload_local(image_data, filename)
+
+        if filename is None:
+            timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
+            unique_id = uuid.uuid4().hex[:8]
+            ext = ".jpg"
+            filename = f"alerts/{timestamp}_{unique_id}{ext}"
+
+        try:
+            self.bucket.put_object(filename, image_data)
+            url = f"{settings.oss.url_prefix}/{filename}"
+            logger.info(f"图片上传OSS成功: {url}")
+            return url
+        except Exception as e:
+            logger.error(f"图片上传OSS失败: {e}")
+            return self._upload_local(image_data, filename)
+
+    def _upload_local(self, image_data: bytes, filename: Optional[str] = None) -> str:
+        upload_dir = Path("uploads")
+        upload_dir.mkdir(exist_ok=True)
+
+        if filename is None:
+            timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
+            unique_id = uuid.uuid4().hex[:8]
+            filename = f"alerts/{timestamp}_{unique_id}.jpg"
+
+        file_path = upload_dir / filename
+        file_path.parent.mkdir(parents=True, exist_ok=True)
+
+        with open(file_path, "wb") as f:
+            f.write(image_data)
+
+        local_url = f"/uploads/{filename}"
+        logger.info(f"图片保存本地: {local_url}")
+        return local_url
+
+    def get_url(self, path: str) -> str:
+        if path.startswith("http"):
+            return path
+        if self.bucket:
+            return f"{settings.oss.url_prefix}/{path}"
+        return f"/uploads/{path}" if not path.startswith("/") else path
+
+
+oss_storage = OSSStorage()
+
+
+def get_oss_storage() -> OSSStorage:
+    return oss_storage