v2.4.1: 修复 2FA 登录和前端数据加载问题

- 修复登录接口 response_model 导致 2FA 返回格式验证失败(500错误)
- 修复 showProfile 未调用 loadTwofaStatus 导致 2FA 状态一直显示加载中
- 修复 hideOthers 默认值为 false 确保管理员可查看所有数据
- 删除重复的 doLogin 函数
- 删除残留的代码片段修复 JavaScript 语法错误

backend/app/api/twofa.py

@@ -0,0 +1,153 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+from pydantic import BaseModel
+import pyotp
+import qrcode
+import io
+import base64
+from app.core.database import get_db
+from app.core.deps import get_current_user
+from app.models.models import User
+
+router = APIRouter(prefix="/auth/2fa", tags=["双因素认证"])
+
+
+class TwoFASetupResponse(BaseModel):
+    secret: str
+    qr_code: str  # base64 encoded QR code image
+    otpauth_url: str
+
+
+class TwoFAVerifyRequest(BaseModel):
+    code: str
+
+
+class TwoFALoginRequest(BaseModel):
+    temp_token: str
+    code: str
+
+
+@router.post("/setup", response_model=TwoFASetupResponse)
+async def setup_2fa(
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """生成 2FA 密钥和二维码"""
+    secret = pyotp.random_base32()
+    
+    totp = pyotp.TOTP(secret)
+    otpauth_url = totp.provisioning_uri(
+        name=user.email,
+        issuer_name="债务管理系统"
+    )
+    
+    # 生成 QR 码
+    qr = qrcode.QRCode(version=1, box_size=10, border=5)
+    qr.add_data(otpauth_url)
+    qr.make(fit=True)
+    img = qr.make_image(fill_color="black", back_color="white")
+    
+    # 转换为 base64
+    buffer = io.BytesIO()
+    img.save(buffer, format="PNG")
+    qr_base64 = base64.b64encode(buffer.getvalue()).decode()
+    
+    # 临时存储 secret（验证后才会真正保存）
+    user.two_factor_secret = secret
+    await db.commit()
+    
+    return TwoFASetupResponse(
+        secret=secret,
+        qr_code=f"data:image/png;base64,{qr_base64}",
+        otpauth_url=otpauth_url
+    )
+
+
+@router.post("/verify")
+async def verify_2fa_setup(
+    req: TwoFAVerifyRequest,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """验证 2FA 设置（首次验证后启用）"""
+    if not user.two_factor_secret:
+        raise HTTPException(status_code=400, detail="请先执行 2FA 设置")
+    
+    totp = pyotp.TOTP(user.two_factor_secret)
+    if not totp.verify(req.code, valid_window=1):
+        raise HTTPException(status_code=400, detail="验证码错误")
+    
+    # 启用 2FA
+    user.two_factor_enabled = 1
+    await db.commit()
+    
+    return {"message": "双因素认证已启用"}
+
+
+@router.post("/disable")
+async def disable_2fa(
+    req: TwoFAVerifyRequest,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """禁用 2FA（需要验证当前验证码）"""
+    if not user.two_factor_enabled:
+        raise HTTPException(status_code=400, detail="未启用双因素认证")
+    
+    if not user.two_factor_secret:
+        raise HTTPException(status_code=400, detail="2FA 配置异常")
+    
+    totp = pyotp.TOTP(user.two_factor_secret)
+    if not totp.verify(req.code, valid_window=1):
+        raise HTTPException(status_code=400, detail="验证码错误")
+    
+    user.two_factor_secret = None
+    user.two_factor_enabled = 0
+    await db.commit()
+    
+    return {"message": "双因素认证已禁用"}
+
+
+@router.post("/verify-login")
+async def verify_2fa_login(
+    req: TwoFALoginRequest,
+    db: AsyncSession = Depends(get_db),
+):
+    """验证 2FA 登录（密码验证后，2FA 验证前）"""
+    from app.core.security import decode_token, create_access_token, create_refresh_token
+    
+    # 验证临时 token
+    payload = decode_token(req.temp_token)
+    if not payload or payload.get("type") != "2fa_pending":
+        raise HTTPException(status_code=401, detail="无效的验证请求")
+    
+    user_id = int(payload["sub"])
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    
+    if not user or not user.two_factor_secret:
+        raise HTTPException(status_code=401, detail="用户状态异常")
+    
+    # 验证 2FA
+    totp = pyotp.TOTP(user.two_factor_secret)
+    if not totp.verify(req.code, valid_window=1):
+        raise HTTPException(status_code=401, detail="验证码错误")
+    
+    # 返回正式 token
+    return {
+        "access_token": create_access_token(user.id),
+        "refresh_token": create_refresh_token(user.id),
+        "token_type": "bearer"
+    }
+
+
+@router.get("/status")
+async def get_2fa_status(
+    user: User = Depends(get_current_user),
+):
+    """获取 2FA 状态"""
+    return {
+        "enabled": bool(user.two_factor_enabled),
+        "has_secret": bool(user.two_factor_secret)
+    }