fix(ui): username change no longer requires password confirmation

app/routers/web.py

@@ -85,14 +85,9 @@ def settings_page(
 def change_username(
     request: Request,
     new_username: str = Form(...),
-    password: str = Form(...),
     user: User = Depends(get_current_user_web),
     db: Session = Depends(get_db),
 ):
-    if not verify_password(password, user.password_hash):
-        return templates.TemplateResponse(
-            "settings.html", {"request": request, "user": user, "error": "密码错误"}, status_code=400
-        )
     if db.query(User).filter(User.username == new_username, User.id != user.id).first():
         return templates.TemplateResponse(
             "settings.html", {"request": request, "user": user, "error": "用户名已存在"}, status_code=400