feat(caddy): add caddy_list_certs whitelist entry and cert parser

- Extend commands.yml.example with caddy_list_certs (sh loop over /data/caddy/certificates/*/*.crt using openssl)
- Add lib/parse-caddy.ts: parseCertList() parses CERTFILE/CERTEND delimited openssl output
- Add shiki ^1.29.2 dependency for server-side Caddyfile syntax highlighting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -27,6 +27,7 @@
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "shadcn": "^4.7.0",
+    "shiki": "^1.29.2",
     "tailwind-merge": "^3.6.0",
     "tw-animate-css": "^1.4.0"
   },