feat(theme): sync defaultTheme=ClassicLight enabledThemes=[ClassicLight,ModernLight] across all 6 fallback locations

server/api/admin/system-settings/index.post.ts

@@ -833,8 +833,8 @@ export default defineEventHandler(async (event) => {
   autoBackupIntervalHours: 24,
   autoBackupRetentionDays: 30,
   statisticsCodeEnabled: false,
-  defaultTheme: 'System',
-  enabledThemes: '["System","ClassicDark","ClassicLight","ModernLight"]'
+  defaultTheme: 'ClassicLight',
+  enabledThemes: '["ClassicLight","ModernLight"]'
 } as const
 
     // 获取当前设置，如果不存在则创建

server/api/site-config.get.ts

@@ -87,8 +87,8 @@ export default defineEventHandler(async (event) => {
           forceBlockAllRequests: false,
           enableReplayRequests: false,
           smtpEnabled: false,
-          defaultTheme: 'System',
-          enabledThemes: '["System","ClassicDark","ClassicLight","ModernLight"]',
+          defaultTheme: 'ClassicLight',
+          enabledThemes: '["ClassicLight","ModernLight"]',
           scheduleDaysBeforeEnabled: false,
           scheduleDaysBefore: 30,
           scheduleDaysAfterEnabled: false,

server/utils/system-settings-defaults.ts

@@ -65,6 +65,6 @@ export const SYSTEM_SETTINGS_DEFAULTS = {
   autoBackupIntervalHours: 24,
   autoBackupRetentionDays: 30,
   statisticsCodeEnabled: false,
-  defaultTheme: 'System',
-  enabledThemes: '["System","ClassicDark","ClassicLight","ModernLight"]'
+  defaultTheme: 'ClassicLight',
+  enabledThemes: '["ClassicLight","ModernLight"]'
 } as const