取消游客模式，强制登录后使用

frontend/src/lib/api.ts

@@ -10,14 +10,14 @@ export interface UserInfo {
   id: string
   username: string
   email?: string
-  role: 'system_admin' | 'admin' | 'user' | 'guest'
+  role: 'system_admin' | 'admin' | 'user'
   status: string
   created_at: string
 }
 
 export interface Role {
   id: number
-  name: 'system_admin' | 'admin' | 'user' | 'guest'
+  name: 'system_admin' | 'admin' | 'user'
   description?: string
   permissions: string[]
   created_at: string
@@ -79,9 +79,6 @@ async function request<T>(
 }
 
 export const api = {
-  publicInfo: () =>
-    request<{ message: string; guest_allowed: boolean }>('/api/public'),
-
   register: (body: { username: string; email?: string; password: string }) =>
     request<AuthResponse>('/api/auth/register', {
       method: 'POST',