chore: 初始化项目结构并添加基础配置文件

添加后端API和前端项目的初始目录结构，包括应用层模块、工具模块和模型定义
配置前后端的.dockerignore文件以排除开发环境文件
添加前端样式文件，包括字体、Tailwind CSS和主题配置
初始化Python虚拟环境中的类型标记文件

后端-孕期报告解读-api/app/middleware/auth.py

@@ -0,0 +1,36 @@
+from datetime import datetime, timedelta, timezone
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from jose import JWTError, jwt
+
+from app.config import settings
+from app.models.user import User
+
+security = HTTPBearer()
+
+
+def create_access_token(user_id: str) -> str:
+    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
+    to_encode = {"sub": user_id, "exp": expire}
+    return jwt.encode(to_encode, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+) -> User:
+    token = credentials.credentials
+    try:
+        payload = jwt.decode(
+            token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm]
+        )
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="无效的认证信息")
+    except JWTError:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Token已过期或无效")
+
+    user = await User.get(user_id)
+    if user is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="用户不存在")
+    return user