merge: 正确合并 main 分支改动

合并 origin/main 最新改动，正确保留所有配置：
- Ops 运维监控配置和功能
- LinuxDo Connect OAuth 配置
- Update 在线更新配置
- 优惠码功能
- 其他 main 分支新功能

修复之前合并时错误删除 LinuxDo 和 Update 配置的问题。

frontend/src/stores/app.ts

@@ -279,11 +279,31 @@ export const useAppStore = defineStore('app', () => {
 
   // ==================== Public Settings Management ====================
 
+  /**
+   * Apply settings to store state (internal helper to avoid code duplication)
+   */
+  function applySettings(config: PublicSettings): void {
+    cachedPublicSettings.value = config
+    siteName.value = config.site_name || 'Sub2API'
+    siteLogo.value = config.site_logo || ''
+    siteVersion.value = config.version || ''
+    contactInfo.value = config.contact_info || ''
+    apiBaseUrl.value = config.api_base_url || ''
+    docUrl.value = config.doc_url || ''
+    publicSettingsLoaded.value = true
+  }
+
   /**
    * Fetch public settings (uses cache unless force=true)
    * @param force - Force refresh from API
    */
   async function fetchPublicSettings(force = false): Promise<PublicSettings | null> {
+    // Check for injected config from server (eliminates flash)
+    if (!publicSettingsLoaded.value && !force && window.__APP_CONFIG__) {
+      applySettings(window.__APP_CONFIG__)
+      return window.__APP_CONFIG__
+    }
+
     // Return cached data if available and not forcing refresh
     if (publicSettingsLoaded.value && !force) {
       if (cachedPublicSettings.value) {
@@ -300,6 +320,7 @@ export const useAppStore = defineStore('app', () => {
         api_base_url: apiBaseUrl.value,
         contact_info: contactInfo.value,
         doc_url: docUrl.value,
+        home_content: '',
         linuxdo_oauth_enabled: false,
         version: siteVersion.value
       }
@@ -313,14 +334,7 @@ export const useAppStore = defineStore('app', () => {
     publicSettingsLoading.value = true
     try {
       const data = await fetchPublicSettingsAPI()
-      cachedPublicSettings.value = data
-      siteName.value = data.site_name || 'Sub2API'
-      siteLogo.value = data.site_logo || ''
-      siteVersion.value = data.version || ''
-      contactInfo.value = data.contact_info || ''
-      apiBaseUrl.value = data.api_base_url || ''
-      docUrl.value = data.doc_url || ''
-      publicSettingsLoaded.value = true
+      applySettings(data)
       return data
     } catch (error) {
       console.error('Failed to fetch public settings:', error)
@@ -338,6 +352,19 @@ export const useAppStore = defineStore('app', () => {
     cachedPublicSettings.value = null
   }
 
+  /**
+   * Initialize settings from injected config (window.__APP_CONFIG__)
+   * This is called synchronously before Vue app mounts to prevent flash
+   * @returns true if config was found and applied, false otherwise
+   */
+  function initFromInjectedConfig(): boolean {
+    if (window.__APP_CONFIG__) {
+      applySettings(window.__APP_CONFIG__)
+      return true
+    }
+    return false
+  }
+
   // ==================== Return Store API ====================
 
   return {
@@ -355,6 +382,7 @@ export const useAppStore = defineStore('app', () => {
     contactInfo,
     apiBaseUrl,
     docUrl,
+    cachedPublicSettings,
 
     // Version state
     versionLoaded,
@@ -391,6 +419,7 @@ export const useAppStore = defineStore('app', () => {
 
     // Public settings actions
     fetchPublicSettings,
-    clearPublicSettingsCache
+    clearPublicSettingsCache,
+    initFromInjectedConfig
   }
 })