feat(api): add OrcaRouter provider preset

Add a named 'orcarouter' preset to the shared provider catalog mirroring
the existing OpenRouter entry: OpenAI-compatible base URL
https://api.orcarouter.ai/v1, default model openai/gpt-5.5, sk-orca-...
key placeholder, and a dashboard icon. Regenerate the throw-error
baseline for the line shift in provider-preset-catalog.ts.

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

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

@@ -0,0 +1,58 @@
+import { describe, expect, it } from 'bun:test';
+import { getPresetById, isValidPresetId } from '../../../src/api/services/provider-presets';
+import { PROVIDER_PRESET_IDS } from '../../../src/shared/provider-preset-catalog';
+
+describe('provider-presets-orcarouter', () => {
+  it('resolves orcarouter preset id', () => {
+    const preset = getPresetById('orcarouter');
+    expect(preset?.id).toBe('orcarouter');
+    expect(preset?.baseUrl).toBe('https://api.orcarouter.ai/v1');
+    expect(preset?.defaultProfileName).toBe('orcarouter');
+  });
+
+  it('registers orcarouter in PROVIDER_PRESET_IDS', () => {
+    expect(PROVIDER_PRESET_IDS).toContain('orcarouter');
+  });
+
+  it('uses the OpenAI-compatible base URL with a /v1 suffix', () => {
+    const preset = getPresetById('orcarouter');
+    expect(preset?.baseUrl).toBe('https://api.orcarouter.ai/v1');
+    expect(preset?.baseUrl.endsWith('/v1')).toBe(true);
+  });
+
+  it('pins a provider/model default (openai/gpt-5.5)', () => {
+    const preset = getPresetById('orcarouter');
+    expect(preset?.defaultModel).toBe('openai/gpt-5.5');
+  });
+
+  it('validates orcarouter preset requires an API key with the sk-orca- placeholder', () => {
+    const preset = getPresetById('orcarouter');
+    expect(preset?.requiresApiKey).toBe(true);
+    expect(preset?.apiKeyPlaceholder).toBe('sk-orca-...');
+  });
+
+  it('is a recommended, featured provider', () => {
+    const preset = getPresetById('orcarouter');
+    expect(preset?.category).toBe('recommended');
+    expect(preset?.featured).toBe(true);
+  });
+
+  it('treats orcarouter as a valid preset id', () => {
+    expect(isValidPresetId('orcarouter')).toBe(true);
+  });
+
+  it('handles whitespace in orcarouter preset id', () => {
+    const preset = getPresetById('  orcarouter  ');
+    expect(preset?.id).toBe('orcarouter');
+  });
+
+  it('handles uppercase orcarouter preset id', () => {
+    const preset = getPresetById('ORCAROUTER');
+    expect(preset?.id).toBe('orcarouter');
+  });
+
+  it('does not resolve partial or invalid orcarouter ids', () => {
+    expect(getPresetById('orcarouter-invalid')).toBeUndefined();
+    expect(isValidPresetId('orcarouter-invalid')).toBe(false);
+  });
+});