docs: 新增 AI 代理学习偏好与信用盘术语规范

feat: 优化登录与入口页面加载体验

- 为登录页面添加 Suspense 边界，统一 fallback 样式
- 重构入口守卫逻辑，在布局阶段处理未登录重定向，避免闪烁
- 登录页面支持会话过期提示，并自动清理 URL 参数

feat: 信用盘与钱包盘文案差异化展示

- 底部导航「钱包」标签在信用盘模式下显示为「信用」
- 大厅余额条在信用盘模式下使用「可

src/i18n/locales/en/entry.json

@@ -49,6 +49,16 @@
   "footer": {
     "secure": "Secure. Trusted. Authorized access."
   },
+  "login": {
+    "title": "Agent player login",
+    "hint": "Sign in with the account your agent created for you. Main-site users should enter from the main site.",
+    "username": "Username",
+    "password": "Password",
+    "submit": "Sign in",
+    "missingFields": "Please enter username and password",
+    "failed": "Sign-in failed",
+    "backEntry": "Back to entry"
+  },
   "errors": {
     "noToken": "No authorization token found",
     "noTokenDetail": "Please return to the main site and try again.",