feat: 优化授权管理添加/编辑页面布局和样式

- 添加 i18n 国际化支持，新增 createForm 翻译
- 统一使用 KeyRound 图标作为授权配置标题
- 优化预览卡片，增加已授权卡类列表展示
- 添加 loading 状态和更完善的表单验证
- 统一使用 textarea 组件替代 UiTextarea
- 与版本管理页面布局保持一致

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

frontend/src/plugins/i18n/en.json

@@ -1703,7 +1703,47 @@
         "my_request": "My Request"
       },
       "reject": "Reject",
-      "remove": "Remove"
+      "remove": "Remove",
+      "createForm": {
+        "title": "Add Authorization",
+        "description": "Add new application authorization for agent",
+        "editTitle": "Edit Authorization",
+        "editDescription": "Modify agent's application authorization configuration",
+        "authConfig": "Authorization Configuration",
+        "authConfigDesc": "Select agent, application and configure card type permissions",
+        "selectAgent": "Select Agent",
+        "selectAgentPlaceholder": "Please select an agent",
+        "selectApp": "Select Application",
+        "selectAppPlaceholder": "Please select an application",
+        "cardPermission": "Card Type Permissions",
+        "selectCardType": "Select Card Type",
+        "addCardType": "Add",
+        "cardTypeList": "Authorized Card Types",
+        "cardTypeName": "Card Type Name",
+        "billingType": "Billing Type",
+        "price": "Price",
+        "pricePlaceholder": "Enter price",
+        "noCardTypes": "Please select card types to add to authorization list",
+        "selectAppFirst": "Please select an application first",
+        "remark": "Remark",
+        "remarkPlaceholder": "Enter remark (optional)",
+        "preview": "Preview",
+        "previewAgent": "Agent",
+        "previewApp": "Application",
+        "previewCardTypes": "Card Types",
+        "previewRemark": "Remark",
+        "confirmAuth": "Confirm Authorization",
+        "updateAuth": "Save Changes",
+        "createSuccess": "Authorization added successfully",
+        "createFailed": "Failed to add authorization",
+        "updateSuccess": "Authorization updated successfully",
+        "updateFailed": "Failed to update authorization",
+        "fetchFailed": "Failed to fetch authorization information",
+        "selectAgentRequired": "Please select an agent",
+        "selectAppRequired": "Please select an application",
+        "selectCardRequired": "Please add at least one card type",
+        "cardCount": "{count} items"
+      }
     },
     "finance": {
       "title": "Finance Management",