refactor: 简化授权管理添加/编辑页面为单卡类选择

- 移除卡类列表，改为单选卡类
- 选择代理 → 选择应用 → 选择卡类 → 设置价格
- 修复面包屑导航名称
- 优化预览卡片展示

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/plugins/i18n/zh.json

@@ -1695,32 +1695,26 @@
       "remove": "移除",
       "createForm": {
         "title": "添加授权",
-        "description": "为代理添加新的应用授权",
+        "description": "为代理添加应用卡类授权",
         "editTitle": "编辑授权",
-        "editDescription": "修改代理的应用授权配置",
+        "editDescription": "修改代理的应用卡类授权配置",
         "authConfig": "授权配置",
-        "authConfigDesc": "选择代理、应用和配置卡类权限",
+        "authConfigDesc": "选择代理、应用和卡类",
         "selectAgent": "选择代理",
         "selectAgentPlaceholder": "请选择代理",
         "selectApp": "选择应用",
         "selectAppPlaceholder": "请选择应用",
-        "cardPermission": "卡类权限",
         "selectCardType": "选择卡类",
         "selectCardTypePlaceholder": "请选择卡类",
-        "addCardType": "添加",
-        "cardTypeList": "已授权卡类",
-        "cardTypeName": "卡类名称",
-        "billingType": "计费类型",
         "price": "价格",
         "pricePlaceholder": "输入价格",
-        "noCardTypes": "请选择卡类添加到授权列表",
-        "selectAppFirst": "请先选择应用",
         "remark": "备注",
         "remarkPlaceholder": "输入备注信息（可选）",
         "preview": "预览",
         "previewAgent": "代理",
         "previewApp": "应用",
-        "previewCardTypes": "授权卡类",
+        "previewCardType": "卡类",
+        "previewPrice": "价格",
         "previewRemark": "备注",
         "confirmAuth": "确认授权",
         "updateAuth": "保存修改",
@@ -1731,8 +1725,7 @@
         "fetchFailed": "获取授权信息失败",
         "selectAgentRequired": "请选择代理",
         "selectAppRequired": "请选择应用",
-        "selectCardRequired": "请至少添加一个卡类",
-        "cardCount": "{count} 个"
+        "selectCardRequired": "请选择卡类"
       }
     },
     "finance": {