fix flake test

apps/mono/vitest.config.ts

@@ -2,6 +2,13 @@ import { cloudflareTest } from '@cloudflare/vitest-pool-workers'
 import { defineConfig } from 'vitest/config'
 
 export default defineConfig({
+	test: {
+		// The facade bundles all 13 worker apps (see mono.app.ts), so the first request in
+		// a run pays a cold start for the lot of it — ~3.4s even on an idle machine. The
+		// 5s default leaves no headroom for that, and the whole-monorepo run puts 21
+		// projects on the CPU at once, which pushed these tests into flaky timeouts.
+		testTimeout: 30_000,
+	},
 	plugins: [
 		cloudflareTest({
 			wrangler: { configPath: `${__dirname}/wrangler.jsonc` },