Feature: Add local OpenAI-compatible model discovery to /model (#201)

* Add local OpenAI-compatible model discovery to /model

* Guard local OpenAI model discovery from Codex routing

* Preserve remote OpenAI Codex alias behavior

src/services/api/providerConfig.local.test.ts

@@ -1,6 +1,22 @@
-import { expect, test } from 'bun:test'
+import { afterEach, expect, test } from 'bun:test'
 
-import { isLocalProviderUrl } from './providerConfig.js'
+import {
+  getAdditionalModelOptionsCacheScope,
+  isLocalProviderUrl,
+  resolveProviderRequest,
+} from './providerConfig.js'
+
+const originalEnv = {
+  CLAUDE_CODE_USE_OPENAI: process.env.CLAUDE_CODE_USE_OPENAI,
+  OPENAI_BASE_URL: process.env.OPENAI_BASE_URL,
+  OPENAI_MODEL: process.env.OPENAI_MODEL,
+}
+
+afterEach(() => {
+  process.env.CLAUDE_CODE_USE_OPENAI = originalEnv.CLAUDE_CODE_USE_OPENAI
+  process.env.OPENAI_BASE_URL = originalEnv.OPENAI_BASE_URL
+  process.env.OPENAI_MODEL = originalEnv.OPENAI_MODEL
+})
 
 test('treats localhost endpoints as local', () => {
   expect(isLocalProviderUrl('http://localhost:11434/v1')).toBe(true)
@@ -33,3 +49,37 @@ test('treats public hosts as remote', () => {
   expect(isLocalProviderUrl('https://example.com/v1')).toBe(false)
   expect(isLocalProviderUrl('http://[2001:4860:4860::8888]:11434/v1')).toBe(false)
 })
+
+test('creates a cache scope for local openai-compatible providers', () => {
+  process.env.CLAUDE_CODE_USE_OPENAI = '1'
+  process.env.OPENAI_BASE_URL = 'http://localhost:1234/v1'
+  process.env.OPENAI_MODEL = 'llama-3.2-3b-instruct'
+
+  expect(getAdditionalModelOptionsCacheScope()).toBe(
+    'openai:http://localhost:1234/v1',
+  )
+})
+
+test('keeps codex alias models on chat completions for local openai-compatible providers', () => {
+  process.env.CLAUDE_CODE_USE_OPENAI = '1'
+  process.env.OPENAI_BASE_URL = 'http://127.0.0.1:8080/v1'
+  process.env.OPENAI_MODEL = 'gpt-5.4'
+
+  expect(resolveProviderRequest()).toMatchObject({
+    transport: 'chat_completions',
+    requestedModel: 'gpt-5.4',
+    resolvedModel: 'gpt-5.4',
+    baseUrl: 'http://127.0.0.1:8080/v1',
+  })
+  expect(getAdditionalModelOptionsCacheScope()).toBe(
+    'openai:http://127.0.0.1:8080/v1',
+  )
+})
+
+test('skips local model cache scope for remote openai-compatible providers', () => {
+  process.env.CLAUDE_CODE_USE_OPENAI = '1'
+  process.env.OPENAI_BASE_URL = 'https://api.openai.com/v1'
+  process.env.OPENAI_MODEL = 'gpt-4o'
+
+  expect(getAdditionalModelOptionsCacheScope()).toBeNull()
+})