feat(auth): add admin bootstrap and username login

Initialize admin bootstrap settings during startup, persist username support in auth flows, and align frontend auth requests with local API behavior.

backend/app/routers/auth.py

@@ -2,6 +2,7 @@ from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
 from app.database import get_db
 from app.models.user import User
 from app.schemas.auth import UserCreate, UserOut, Token
@@ -32,18 +33,30 @@ async def get_current_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
+    username = user_data.username.strip()
+    if not username:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="用户名不能为空")
+
+    result = await db.execute(select(User).where(User.username == username))
+    if result.scalar_one_or_none():
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="用户名已被注册")
+
     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(
+        username=username,
         email=user_data.email,
         hashed_password=get_password_hash(user_data.password),
         full_name=user_data.full_name,
     )
     db.add(user)
-    await db.commit()
+    try:
+        await db.commit()
+    except IntegrityError:
+        await db.rollback()
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="用户名或邮箱已被注册")
     await db.refresh(user)
     return user
 
@@ -51,24 +64,34 @@ async def register(user_data: UserCreate, db: AsyncSession = Depends(get_db)):
 @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.username == identifier))
+        user = result.scalar_one_or_none()
+
     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()
+        escaped_identifier = (
+            identifier
+            .replace('\\', '\\\\')
+            .replace('%', '\\%')
+            .replace('_', '\\_')
+        )
+        result = await db.execute(
+            select(User).where(User.email.like(f"{escaped_identifier}@%", escape='\\'))
+        )
+        prefix_matches = result.scalars().all()
+        if len(prefix_matches) == 1:
+            user = prefix_matches[0]
 
     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")