feat: 添加全局配置以控制注册功能，更新相关组件以适应新逻辑

app/components/TopNav.vue

@@ -6,6 +6,7 @@ const navHidden = ref(false)
 const route = useRoute()
 
 const { loggedIn, user, clear, initialized } = useAuthSession()
+const { config: globalConfig } = useGlobalConfig()
 
 const links: any = [
   { to: "/", label: "首页"  },
@@ -66,7 +67,7 @@ watch(() => route.path, () => {
         </li>
         <li v-if="!loggedIn && initialized" class="mobile-auth">
           <NuxtLink to="/auth/login" class="auth-link">登录</NuxtLink>
-          <NuxtLink to="/auth/register" class="auth-btn">注册</NuxtLink>
+          <NuxtLink v-if="globalConfig.allowRegister" to="/auth/register" class="auth-btn">注册</NuxtLink>
         </li>
         <li v-else-if="loggedIn && initialized" class="mobile-auth">
           <NuxtLink class="auth-link">{{ user?.username }}</NuxtLink>
@@ -75,7 +76,7 @@ watch(() => route.path, () => {
 
       <div v-if="!loggedIn && initialized" class="nav-auth">
         <NuxtLink to="/auth/login" class="auth-link">登录</NuxtLink>
-        <NuxtLink to="/auth/register" class="auth-btn">注册</NuxtLink>
+        <NuxtLink v-if="globalConfig.allowRegister" to="/auth/register" class="auth-btn">注册</NuxtLink>
       </div>
       <div v-else-if="loggedIn && initialized" class="nav-auth">
         <NuxtLink to="/admin/dashboard" class="auth-btn">管理</NuxtLink>

app/middleware/auth.global.ts

@@ -5,7 +5,7 @@ import {
   normalizeSafeRedirect,
 } from "@/utils/auth-routes";
 import { useAuthSession } from "../composables/useAuthSession";
-import { FRONTEND_LOGIN_PATH } from "common/config"
+import { FRONTEND_LOGIN_PATH, FRONTEND_REGISTER_PATH } from "common/config"
 
 export default defineNuxtRouteMiddleware(async (to) => {
   if(to.path.startsWith("/__nuxt_error")) {
@@ -45,6 +45,15 @@ export default defineNuxtRouteMiddleware(async (to) => {
     });
   }
 
+  if (!isLoggedIn && currentPath === FRONTEND_REGISTER_PATH) {
+    const { config: globalConfig } = useGlobalConfig();
+    if (globalConfig.value.allowRegister === false) {
+      const { $toast } = useNuxtApp();
+      $toast?.warning("当前已关闭注册");
+      return navigateTo(FRONTEND_LOGIN_PATH);
+    }
+  }
+
   if (isLoggedIn && isGuestOnlyRoute(currentPath)) {
     const redirectCandidate = Array.isArray(to.query.redirect)
       ? to.query.redirect[0]

app/pages/auth/login.vue

@@ -5,6 +5,7 @@ definePageMeta({
 
 const route = useRoute()
 const { $toast } = useNuxtApp()
+const { config: globalConfig } = useGlobalConfig()
 const redirect = computed(() => route.query.redirect as string || '/')
 
 const loginForm = reactive({
@@ -172,7 +173,7 @@ onMounted(() => {
                     </button> -->
                 </div>
 
-                <p class="form-footer">
+                <p v-if="globalConfig.allowRegister" class="form-footer">
                     还没有账户？<NuxtLink to="/auth/register">立即注册</NuxtLink>
                 </p>
             </div>

app/pages/auth/register.vue

@@ -4,6 +4,14 @@ definePageMeta({
 })
 
 const { $toast } = useNuxtApp()
+const { config: globalConfig } = useGlobalConfig()
+
+watch(() => globalConfig.allowRegister, (val) => {
+    if (val === false) {
+        $toast.error('当前已关闭注册')
+        navigateTo('/auth/login')
+    }
+}, { immediate: true })
 
 const registerForm = reactive({
     username: '',