fix: generate_promo_code 用 request._run_ns 替代 ServerEnv()

env = request._run_ns 绑定 request 上下文，env.get_user() 正确返回 userid 字符串

discount/init.py

@@ -487,10 +487,10 @@ async def list_marketings(request, params_kw):
 async def generate_promo_code(request, params_kw):
     """Generate a promo code (sale role).
     marketing_id can be empty (pure invitation code)."""
-    env = ServerEnv()
+    env = request._run_ns
     dbname = env.get_module_dbname('discount')
     resellerid = await env.get_userorgid()
-    sale_id = await env.get_userid()
+    sale_id = await env.get_user()
     marketing_id = params_kw.get('marketing_id')  # can be empty
     
     async with DBPools().sqlorContext(dbname) as sor: