fix(ccswitch): preserve Codex provider root endpoint

frontend/src/utils/__tests__/ccswitchImport.spec.ts

@@ -27,28 +27,12 @@ describe('ccswitchImport utils', () => {
     usageScript: 'return true'
   }
 
-  it('adds the Codex model parameter for OpenAI imports', () => {
-    const params = paramsFromDeeplink(
-      buildCcSwitchImportDeeplink({
-        ...baseInput,
-        platform: 'openai',
-        clientType: 'claude'
-      })
-    )
-
-    expect(params.get('resource')).toBe('provider')
-    expect(params.get('app')).toBe('codex')
-    expect(params.get('endpoint')).toBe(`${baseInput.baseUrl}/v1`)
-    expect(params.get('model')).toBe(OPENAI_CC_SWITCH_CODEX_MODEL)
-    expect(atob(params.get('usageScript') || '')).toBe(baseInput.usageScript)
-  })
-
   it.each([
-    'https://api.example.com',
-    'https://api.example.com/',
-    'https://api.example.com/v1',
-    'https://api.example.com/v1/'
-  ])('imports Codex with exactly one /v1 suffix for base URL %s', (baseUrl) => {
+    ['https://api.example.com', 'https://api.example.com'],
+    ['https://api.example.com/', 'https://api.example.com'],
+    ['https://api.example.com/v1', 'https://api.example.com/v1'],
+    ['https://api.example.com/v1/', 'https://api.example.com/v1']
+  ])('keeps Codex imports on the configured endpoint for base URL %s', (baseUrl, endpoint) => {
     const params = paramsFromDeeplink(
       buildCcSwitchImportDeeplink({
         ...baseInput,
@@ -58,7 +42,11 @@ describe('ccswitchImport utils', () => {
       })
     )
 
-    expect(params.get('endpoint')).toBe('https://api.example.com/v1')
+    expect(params.get('resource')).toBe('provider')
+    expect(params.get('app')).toBe('codex')
+    expect(params.get('endpoint')).toBe(endpoint)
+    expect(params.get('model')).toBe(OPENAI_CC_SWITCH_CODEX_MODEL)
+    expect(atob(params.get('usageScript') || '')).toBe(baseInput.usageScript)
   })
 
   it.each([

frontend/src/utils/ccswitchImport.ts

@@ -25,6 +25,10 @@ function withV1Endpoint(baseUrl: string): string {
   return normalizedBaseUrl.endsWith('/v1') ? normalizedBaseUrl : `${normalizedBaseUrl}/v1`
 }
 
+function withoutTrailingSlashes(baseUrl: string): string {
+  return baseUrl.replace(/\/+$/, '')
+}
+
 export function resolveCcSwitchImportConfig(
   platform: GroupPlatform | undefined | null,
   clientType: CcSwitchClientType,
@@ -39,7 +43,9 @@ export function resolveCcSwitchImportConfig(
     case 'openai':
       return {
         app: 'codex',
-        endpoint: withV1Endpoint(baseUrl),
+        // CC Switch's Codex provider appends the OpenAI-compatible path itself.
+        // Passing /v1 here can make the client request /v1/v1/....
+        endpoint: withoutTrailingSlashes(baseUrl),
         model: OPENAI_CC_SWITCH_CODEX_MODEL
       }
     case 'gemini':