refactor: 移除developer目录，统一使用admin角色；重命名developer-sidebar为admin-sidebar；修复路由守卫和header中的developer引用

frontend/src/router/guard/index.ts

@@ -15,7 +15,7 @@ export function createRouterGuard(router: Router) {
       }
     }
 
-    const requiresAuth = to.path.startsWith('/developer') || to.path.startsWith('/agent')
+    const requiresAuth = to.path.startsWith('/admin') || to.path.startsWith('/agent')
     const isAuthPage = to.path === '/login' || to.path === '/register'
 
     if (requiresAuth && !token) {
@@ -30,7 +30,7 @@ export function createRouterGuard(router: Router) {
       if (user.role === 'agent' || user.parent_agent_id) {
         return '/agent'
       }
-      return '/developer'
+      return '/admin'
     }
   })
 }