feat: add Codex OAuth login and fix channel config display

- Add OpenAI Codex Device Code Flow login (backend polling + frontend modal)
- Codex provider integrated into preset dropdown (hides URL/API key fields)
- Sync provider model catalogs with Hermes system
- Fix channel config not displaying on first visit (wait for data load)
- Fix sidebar model list not refreshing after adding provider
- Add autocomplete="off" to API key input to prevent browser autofill

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

packages/client/src/shared/providers.ts

@@ -221,6 +221,12 @@ export const PROVIDER_PRESETS: ProviderPreset[] = [
     base_url: 'https://opencode.ai/zen/go/v1',
     models: ['glm-5.1', 'glm-5', 'kimi-k2.5', 'mimo-v2-pro', 'mimo-v2-omni', 'minimax-m2.7', 'minimax-m2.5'],
   },
+  {
+    label: 'OpenAI Codex',
+    value: 'openai-codex',
+    base_url: 'https://chatgpt.com/backend-api/codex',
+    models: ['gpt-5.4-mini', 'gpt-5.4', 'gpt-5.3-codex', 'gpt-5.2-codex', 'gpt-5.1-codex-max', 'gpt-5.1-codex-mini'],
+  },
   {
     label: 'Arcee AI',
     value: 'arcee',