fix(frontend): disable Cloudflare KV session persistence

Session KV binding was causing deployment error. Since the project
doesn't use sessions, disable persistence to avoid the binding requirement.

apps/frontend/astro.config.mjs

@@ -13,6 +13,9 @@ export default defineConfig({
       enabled: true,
       configPath: './wrangler.jsonc',
     },
+    session: {
+      persistence: 'none',
+    },
   }),
   vite: {
     plugins: [tailwindcss()],