✨ refactor(wallet): Top-up layout to embed subscription plans into the recharge card tabs

- Defaulting to subscriptions when available and avoiding initial flash when no plans exist.
- Adjust the wide-screen layout to place wallet and invite sections side by side, simplify the subscription header and controls, and add padding to prevent card borders from clipping.
- Update related i18n strings by adding the new tab label and removing the obsolete subscription blurb.

web/src/i18n/locales/zh.json

@@ -2706,7 +2706,7 @@
     "绑定订阅套餐": "绑定订阅套餐",
     "绑定后会立即生成用户订阅（无需支付），有效期按套餐配置计算。": "绑定后会立即生成用户订阅（无需支付），有效期按套餐配置计算。",
     "订阅套餐": "订阅套餐",
-    "购买订阅获得模型额度/次数": "购买订阅获得模型额度/次数",
+    "额度充值": "额度充值",
     "优先订阅": "优先订阅",
     "优先钱包": "优先钱包",
     "仅用订阅": "仅用订阅",