fix: serve social bind callback route

routes/pages.py

@@ -127,6 +127,12 @@ def register_page():
     return render_app_spa_or_legacy("register.html")
 
 
+@pages_bp.route("/social-bind-callback")
+def social_bind_callback_page():
+    """快捷登录绑定回调页面（由前端路由继续处理授权参数）。"""
+    return render_app_spa_or_legacy("index.html")
+
+
 @pages_bp.route("/app")
 @login_required
 def app_page():