feat: 更新 Service Worker 版本管理，优化缓存策略，增加未处理更新的提示

Web/public/service-worker.js

@@ -1,4 +1,5 @@
-const CACHE_NAME = 'emailbill-v1';
+const VERSION = '1.0.0'; // Build Time: 2026-01-07 15:59:36
+const CACHE_NAME = `emailbill-${VERSION}`;
 const urlsToCache = [
   '/',
   '/index.html',
@@ -57,11 +58,13 @@ self.addEventListener('fetch', (event) => {
     event.respondWith(
       fetch(request)
         .then((response) => {
-          // 克隆响应以便缓存
-          const responseClone = response.clone();
-          caches.open(CACHE_NAME).then((cache) => {
-            cache.put(request, responseClone);
-          });
+          // 只针对成功的GET请求进行缓存
+          if (request.method === 'GET' && response.status === 200) {
+            const responseClone = response.clone();
+            caches.open(CACHE_NAME).then((cache) => {
+              cache.put(request, responseClone);
+            });
+          }
           return response;
         })
         .catch(() => {
@@ -72,7 +75,25 @@ self.addEventListener('fetch', (event) => {
     return;
   }
 
-  // 静态资源使用缓存优先策略
+  // 页面请求使用网络优先策略，确保能获取到最新的 index.html
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request)
+        .then((response) => {
+          const responseClone = response.clone();
+          caches.open(CACHE_NAME).then((cache) => {
+            cache.put(request, responseClone);
+          });
+          return response;
+        })
+        .catch(() => {
+          return caches.match('/index.html') || caches.match(request);
+        })
+    );
+    return;
+  }
+
+  // 其他静态资源使用缓存优先策略
   event.respondWith(
     caches.match(request)
       .then((response) => {