fix(sqlite,browser): resolve SQLite connection pool deadlock, disable stale SW cache, and update BRAIN.md

frontend/index.html

@@ -15,10 +15,13 @@
     <div id="root"></div>
     <script type="module" src="/src/main.tsx"></script>
     <script>
+      if ('caches' in window) {
+        caches.keys().then((keys) => keys.forEach((k) => caches.delete(k))).catch(() => {});
+      }
       if ('serviceWorker' in navigator) {
-        window.addEventListener('load', () => {
-          navigator.serviceWorker.register('/sw.js').catch(() => {});
-        });
+        navigator.serviceWorker.getRegistrations().then((regs) => {
+          regs.forEach((r) => r.unregister());
+        }).catch(() => {});
       }
     </script>
   </body>