feat: add inline referral commission editing in admin user card

Admins can now edit individual referral commission percent directly
in the user detail card. Shows "Default" when no custom value is set.

src/locales/zh.json

@@ -1615,7 +1615,9 @@
           "title": "推荐计划",
           "referrals": "推荐人数",
           "earned": "已赚取",
-          "commission": "佣金"
+          "commission": "佣金",
+          "default": "默认",
+          "invalidPercent": "佣金必须在0到100之间"
         },
         "restrictions": {
           "title": "限制",