fix: SW 缓存导致页面不更新 — fetch 绕过 HTTP 缓存 + hydration 闪屏修复

- sw.js: HTML fetch 加 cache:"no-cache"，避免从浏览器缓存拿旧页面
- ServiceWorkerRegistrar: 注册时 updateViaCache:"none"，确保 SW 自身及时更新
- blindbox/page: 增加 hydrated 状态，防止 SSR/CSR 内容不一致导致闪屏

public/sw.js

@@ -57,7 +57,7 @@ self.addEventListener("fetch", (event) => {
 
   // HTML pages: network-first, fallback to cache, then offline page
   event.respondWith(
-    fetch(request)
+    fetch(request, { cache: "no-cache" })
       .then((response) => {
         const clone = response.clone();
         caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));