fix: remove ACME cert scanning to eliminate caddy-data permission issue (#88)

Caddy's certmagic creates storage dirs with hardcoded 0700 permissions,
making the web container's supplementary group membership ineffective.
Rather than working around this with ACLs or chmod hacks, remove the
feature entirely — it was cosmetic (issuer/expiry display) for certs
that Caddy auto-manages anyway.

Also bump access list dropdown timeout from 5s to 10s to fix flaky E2E test.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/helpers/proxy-api.ts

@@ -90,7 +90,7 @@ export async function createProxyHost(page: Page, config: ProxyHostConfig): Prom
     await accessListTrigger.scrollIntoViewIfNeeded();
     await accessListTrigger.click();
     const option = page.getByRole('option', { name: config.accessListName });
-    await expect(option).toBeVisible({ timeout: 5_000 });
+    await expect(option).toBeVisible({ timeout: 10_000 });
     await option.click();
   }