Optimize tablet load: defer health check, lighten service worker, drop Google Fonts.

Co-authored-by: Cursor <cursoragent@cursor.com>

pwa/sw.js

@@ -1,14 +1,10 @@
 /**
- * Trading Studio PWA Service Worker
- * 缓存应用壳，支持离线打开已访问页面；API 请求始终走网络。
+ * Trading Studio PWA Service Worker（轻量版）
+ * 仅处理导航请求，不拦截 Gradio 静态资源 — 避免平板端加载变慢。
  */
-const CACHE_NAME = "trading-studio-v1";
-const SHELL = ["/", "/manifest.webmanifest"];
+const CACHE_NAME = "trading-studio-v2";
 
 self.addEventListener("install", (event) => {
-  event.waitUntil(
-    caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL)).catch(() => {})
-  );
   self.skipWaiting();
 });
 
@@ -23,28 +19,13 @@ self.addEventListener("activate", (event) => {
 
 self.addEventListener("fetch", (event) => {
   const { request } = event;
-  const url = new URL(request.url);
 
-  // API / 文件上传 / Gradio 动态接口不走缓存
-  if (
-    request.method !== "GET" ||
-    url.pathname.startsWith("/gradio_api") ||
-    url.pathname.startsWith("/file=") ||
-    url.pathname.startsWith("/upload") ||
-    url.pathname.includes("call")
-  ) {
+  // 仅缓存页面导航，Gradio JS/CSS/API 全部直连网络
+  if (request.method !== "GET" || request.mode !== "navigate") {
     return;
   }
 
   event.respondWith(
-    fetch(request)
-      .then((response) => {
-        if (response.ok && url.origin === self.location.origin) {
-          const clone = response.clone();
-          caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
-        }
-        return response;
-      })
-      .catch(() => caches.match(request).then((r) => r || caches.match("/")))
+    fetch(request).catch(() => caches.match("/"))
   );
 });