fix(analytics): 更新Google Analytics配置和变量命名

更新环境变量命名以匹配GA4标准，并调整默认存储权限配置
添加页面浏览跟踪逻辑，当用户同意分析时发送页面数据

src/lib/analytics.ts

@@ -174,6 +174,14 @@ export const updateConsentDetailed = (preferences: CookiePreferences) => {
       personalization_storage: preferences.marketing ? 'granted' : 'denied',
       security_storage: 'granted',
     });
+
+    if (preferences.analytics) {
+      window.gtag('config', GA_MEASUREMENT_ID, {
+        page_path: window.location.pathname + window.location.search,
+        page_title: document.title,
+        page_location: window.location.href,
+      });
+    }
   }
 };