feat: wire native Codex UI as /console entry, keep classic console at /console-classic

- Vendor codex-ui-stack host/ as cloud/codex-ui-host/ (original/ not vendored, 650MB)
- Bridge emulates 7 methods missing in codex 0.164.0-alpha.9, exposes 29
  experimental-protocol methods (150 -> 179), Linux binary candidates,
  read-only POST /__codex_git
- GET /console 302s to the UI host (:8095) when reachable, else falls back
  to the classic React console; GET /console-classic always serves it
- Alignment tables: docs/codex-native-ui-alignment.md
- Tests: test_console 7, new test_codex_ui_host 4, handler method pin 247 -> 249

cloud/codex-ui-host/host/relay-config.json

@@ -0,0 +1,11 @@
+{
+  "providerId": "bumian",
+  "providerName": "Bumian Relay",
+  "baseUrl": "http://127.0.0.1:8095/mockrelay/v1",
+  "relayBaseUrl": "https://www.bumianapi.top/v1",
+  "apiKey": "",
+  "envKey": "BUMIAN_API_KEY",
+  "model": "gpt-6.1-sol",
+  "wireApi": "responses",
+  "chatgptBaseUrl": "http://127.0.0.1:8095/mock"
+}