fix: env = request._run_ns 替代 ServerEnv()，修复dspy中get_user返回None

wwwroot/promote/index.dspy

@@ -2,21 +2,19 @@
 # 参数: code=促销码id 或 id=discount_qr id
 # 已登录: 直接绑定; 未登录: 提示登录/注册
 
-from ahserver.serverenv import ServerEnv
-
+env = request._run_ns
 code = params_kw.get('code', '')
 qr_id = params_kw.get('id', '')
 
-env = ServerEnv()
 user = await env.get_user()
 
 if not user:
     # 未登录 - 显示登录/注册引导
     back_url = ''
     if code:
-        back_url = env.entire_url('./promote') + f'?code={code}'
+        back_url = env.entire_url('./promote/index.dspy') + f'?code={code}'
     elif qr_id:
-        back_url = env.entire_url('./promote') + f'?id={qr_id}'
+        back_url = env.entire_url('./promote/index.dspy') + f'?id={qr_id}'
 
     result = {
         "widgettype": "VBox",