fix: route OpenRouter profiles through v1 API

tests/unit/api/profile-writer-anthropic.test.ts

@@ -134,7 +134,7 @@ describe('profile-writer Anthropic direct', () => {
   it('preserves OpenRouter ANTHROPIC_API_KEY blank behavior', () => {
     const result = createApiProfile(
       'openrouter-test',
-      'https://openrouter.ai/api',
+      'https://openrouter.ai/api/v1',
       'sk-or-testkey',
       { default: 'anthropic/claude-opus-4.5', opus: 'anthropic/claude-opus-4.5', sonnet: 'anthropic/claude-opus-4.5', haiku: 'anthropic/claude-opus-4.5' }
     );
@@ -145,7 +145,7 @@ describe('profile-writer Anthropic direct', () => {
     const settings = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
 
     // OpenRouter: proxy mode with ANTHROPIC_API_KEY explicitly blank
-    expect(settings.env.ANTHROPIC_BASE_URL).toBe('https://openrouter.ai/api');
+    expect(settings.env.ANTHROPIC_BASE_URL).toBe('https://openrouter.ai/api/v1');
     expect(settings.env.ANTHROPIC_AUTH_TOKEN).toBe('sk-or-testkey');
     expect(settings.env.ANTHROPIC_API_KEY).toBe('');
   });

tests/unit/api/provider-presets.test.ts

@@ -92,6 +92,11 @@ describe('provider-presets', () => {
     expect(isValidPresetId('hf')).toBe(true);
   });
 
+  it('uses OpenRouter v1 as the OpenAI-compatible API root', () => {
+    const preset = getPresetById('openrouter');
+    expect(preset?.baseUrl).toBe('https://openrouter.ai/api/v1');
+  });
+
   it('keeps Anthropic direct last in the recommended preset order and reuses the Claude logo', () => {
     const recommendedPresetIds = PROVIDER_PRESETS.filter(
       (preset) => preset.category === 'recommended'

tests/unit/proxy/upstream-url.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from 'bun:test';
+import {
+  resolveOpenAIChatCompletionsUrl,
+  resolveOpenAIModelsUrl,
+} from '../../../src/proxy/upstream-url';
+
+describe('OpenAI-compatible upstream URL resolution', () => {
+  it('routes current OpenRouter API roots through /api/v1', () => {
+    expect(resolveOpenAIChatCompletionsUrl('https://openrouter.ai/api/v1')).toBe(
+      'https://openrouter.ai/api/v1/chat/completions'
+    );
+    expect(resolveOpenAIModelsUrl('https://openrouter.ai/api/v1')).toBe(
+      'https://openrouter.ai/api/v1/models'
+    );
+  });
+
+  it('repairs legacy OpenRouter /api roots before appending OpenAI endpoints', () => {
+    expect(resolveOpenAIChatCompletionsUrl('https://openrouter.ai/api')).toBe(
+      'https://openrouter.ai/api/v1/chat/completions'
+    );
+    expect(resolveOpenAIModelsUrl('https://openrouter.ai/api')).toBe(
+      'https://openrouter.ai/api/v1/models'
+    );
+  });
+
+  it('does not rewrite non-OpenRouter /api roots', () => {
+    expect(resolveOpenAIChatCompletionsUrl('https://example.test/api')).toBe(
+      'https://example.test/api/chat/completions'
+    );
+  });
+});