Add FastAPI backend with agent system

backend/app/routers/auth.py

@@ -0,0 +1,83 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+from app.database import get_db
+from app.models.user import User
+from app.schemas.auth import UserCreate, UserOut, Token
+from app.services.auth_service import verify_password, get_password_hash, create_access_token, decode_token
+from app.config import settings
+
+router = APIRouter(prefix="/api/auth", tags=["认证"])
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    payload = decode_token(token)
+    if payload is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="无效的认证令牌")
+    user_id = payload.get("sub")
+    if user_id is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="无效的认证令牌")
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    if user is None or not user.is_active:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="用户不存在或已禁用")
+    return user
+
+
+@router.post("/register", response_model=UserOut, status_code=status.HTTP_201_CREATED)
+async def register(user_data: UserCreate, db: AsyncSession = Depends(get_db)):
+    # 检查邮箱是否已存在
+    result = await db.execute(select(User).where(User.email == user_data.email))
+    if result.scalar_one_or_none():
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="邮箱已被注册")
+    # 创建用户
+    user = User(
+        email=user_data.email,
+        hashed_password=get_password_hash(user_data.password),
+        full_name=user_data.full_name,
+    )
+    db.add(user)
+    await db.commit()
+    await db.refresh(user)
+    return user
+
+
+@router.post("/login", response_model=Token)
+async def login(form_data: OAuth2PasswordRequestForm = Depends(), db: AsyncSession = Depends(get_db)):
+    identifier = form_data.username.strip()
+    # 支持：邮箱 / UUID / 用户名前缀
+    user = None
+
+    # 1. 尝试 UUID
+    import re
+    if re.match(r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$', identifier, re.I):
+        result = await db.execute(select(User).where(User.id == identifier))
+        user = result.scalar_one_or_none()
+
+    # 2. 尝试邮箱
+    if not user:
+        result = await db.execute(select(User).where(User.email == identifier))
+        user = result.scalar_one_or_none()
+
+    # 3. 尝试用户名前缀（email@ 前面的部分）
+    if not user and '@' not in identifier:
+        result = await db.execute(select(User).where(User.email.like(f"{identifier}@%")))
+        user = result.scalar_one_or_none()
+
+    if not user or not verify_password(form_data.password, user.hashed_password):
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="用户名、邮箱或密码错误")
+    if not user.is_active:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="用户已被禁用")
+    access_token = create_access_token(data={"sub": user.id})
+    return Token(access_token=access_token)
+
+
+@router.get("/me", response_model=UserOut)
+async def get_me(current_user: User = Depends(get_current_user)):
+    return current_user