style(frontend): 统一核心模块代码风格

- Composables: 优化 OAuth 相关 hooks 代码格式
- Stores: 规范状态管理模块格式
- Types: 统一类型定义格式
- Utils: 优化工具函数格式
- App.vue & style.css: 调整全局样式和主组件格式

frontend/src/App.vue

@@ -26,17 +26,25 @@ function updateFavicon(logoUrl: string) {
 }
 
 // Watch for site settings changes and update favicon/title
-watch(() => appStore.siteLogo, (newLogo) => {
-  if (newLogo) {
-    updateFavicon(newLogo)
-  }
-}, { immediate: true })
+watch(
+  () => appStore.siteLogo,
+  (newLogo) => {
+    if (newLogo) {
+      updateFavicon(newLogo)
+    }
+  },
+  { immediate: true }
+)
 
-watch(() => appStore.siteName, (newName) => {
-  if (newName) {
-    document.title = `${newName} - AI API Gateway`
-  }
-}, { immediate: true })
+watch(
+  () => appStore.siteName,
+  (newName) => {
+    if (newName) {
+      document.title = `${newName} - AI API Gateway`
+    }
+  },
+  { immediate: true }
+)
 
 onMounted(async () => {
   // Check if setup is needed