前端权限管理：实现接口级权限管理UI和监控仪表板

新增功能：
- 新增 ApiPermissions.vue 主页面，支持模块级/接口级权限切换
- 新增 ProjectPermissionsModule.vue 组件，展示模块级权限矩阵
- 新增 ApiEndpointPermissions.vue 组件，展示接口级权限矩阵
- 新增 PermissionMonitoring.vue 组件，展示权限系统监控仪表板
- 更新 projectPermissions.ts API 客户端，支持接口级权限和监控API
- 新增权限相关的 TypeScript 类型定义
- 更新路由配置，添加接口级权限管理路由
- 更新国际化文本，添加权限管理相关的中文文本

API 客户端新增函数：
- fetchApiEndpointPermissions: 获取接口级权限矩阵
- updateApiEndpointPermissions: 更新接口级权限矩阵
- fetchPermissionMetrics: 获取权限检查指标
- fetchCacheStats: 获取缓存统计
- fetchPermissionAlerts: 获取告警列表
- fetchPermissionHealth: 获取系统健康状态
- resetPermissionMetrics: 重置指标
- clearPermissionAlerts: 清除告警

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/router/index.ts

@@ -20,6 +20,7 @@ import ProjectMembers from "../views/admin/ProjectMembers.vue";
 import AdminSites from "../views/admin/Sites.vue";
 import ProjectDetail from "../views/admin/ProjectDetail.vue";
 import ProjectPermissions from "../views/admin/ProjectPermissions.vue";
+import ApiPermissions from "../views/admin/ApiPermissions.vue";
 import ProfileSettings from "../views/ProfileSettings.vue";
 import ProjectOverview from "../views/ia/ProjectOverview.vue";
 import ProjectMilestones from "../views/ia/ProjectMilestones.vue";
@@ -447,6 +448,12 @@ const routes: RouteRecordRaw[] = [
         component: ProjectPermissions,
         meta: { title: "权限管理", adminProjectPermission: { module: "project_members", action: "write" } },
       },
+      {
+        path: "projects/:id/api-permissions",
+        name: "AdminApiPermissions",
+        component: ApiPermissions,
+        meta: { title: "接口级权限管理", adminProjectPermission: { module: "project_members", action: "write" } },
+      },
       {
         path: "projects/:projectId/sites",
         name: "AdminSites",