[codex] add coding plan site initialization flow (#351)

* add coding plan site initialization flow

* fix ci for coding plan site init flow

* address coding plan review comments

src/web/pages/helpers/defaultConnectionSegment.test.ts

@@ -10,6 +10,7 @@ describe('defaultConnectionSegment', () => {
     expect(resolveInitialConnectionSegment('one-hub')).toBe('session');
     expect(resolveInitialConnectionSegment('done-hub')).toBe('session');
     expect(resolveInitialConnectionSegment('sub2api')).toBe('session');
+    expect(resolveInitialConnectionSegment('codex')).toBe('session');
   });
 
   it('maps API-key-only platforms to the apikey segment', () => {

src/web/pages/helpers/defaultConnectionSegment.ts

@@ -8,6 +8,7 @@ const SESSION_FIRST_PLATFORMS = new Set([
   'one-hub',
   'done-hub',
   'sub2api',
+  'codex',
 ]);
 
 const API_KEY_FIRST_PLATFORMS = new Set([

src/web/pages/helpers/sitesEditor.ts

@@ -23,6 +23,7 @@ export type SiteSavePayload = {
   url: string;
   externalCheckinUrl: string;
   platform: string;
+  initializationPresetId?: string | null;
   proxyUrl: string;
   useSystemProxy: boolean;
   customHeaders: string;