refactor: 删除服务器配置检查，注册链接始终显示

- 删除 /jingrow/server-config API 调用
- 移除服务器配置检查逻辑
- 设置注册链接始终显示（showSignupLink 默认为 true）
- 消除 404 错误

src/views/HomePage.vue

@@ -24,7 +24,7 @@ const loginFormRef = ref()
 const signupFormRef = ref()
 const loginLoading = ref(false)
 const signupLoading = ref(false)
-const showSignupLink = ref(false)
+const showSignupLink = ref(true)
 
 // 登录表单
 const loginFormData = reactive({
@@ -991,18 +991,6 @@ onMounted(async () => {
   // 初始化认证状态
   await authStore.initAuth()
   
-  // 检查服务器配置，判断是否显示注册链接
-  try {
-    const response = await fetch('/jingrow/server-config')
-    if (response.ok) {
-      const data = await response.json()
-      if (data.success && data.jingrow_server_url === 'https://cloud.jingrow.com') {
-        showSignupLink.value = true
-      }
-    }
-  } catch (error) {
-    console.error('Failed to get server config:', error)
-  }
   
   // 检测移动端
   checkIsMobile()

src/views/auth/Login.vue

@@ -82,7 +82,7 @@ const authStore = useAuthStore()
 
 const formRef = ref()
 const loading = ref(false)
-const showSignupLink = ref(false)
+const showSignupLink = ref(true)
 
 const formData = reactive({
   username: '',
@@ -133,18 +133,6 @@ onMounted(async () => {
     return
   }
   
-  // 检查服务器配置，判断是否显示注册链接
-  try {
-    const response = await fetch('/jingrow/server-config')
-    if (response.ok) {
-      const data = await response.json()
-      if (data.success && data.jingrow_server_url === 'https://cloud.jingrow.com') {
-        showSignupLink.value = true
-      }
-    }
-  } catch (error) {
-    console.error('Failed to get server config:', error)
-  }
 })
 </script>