feat(api): add Fireworks AI provider preset (#1543)

Promotes Fireworks AI to a first-class discoverable preset over the existing Anthropic-compatible Bearer path. Closes #890.

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

@@ -0,0 +1,52 @@
+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-fireworks', () => {
+  it('resolves fireworks preset id', () => {
+    const preset = getPresetById('fireworks');
+    expect(preset?.id).toBe('fireworks');
+    expect(preset?.baseUrl).toBe('https://api.fireworks.ai/inference');
+    expect(preset?.defaultProfileName).toBe('fireworks');
+  });
+
+  it('registers fireworks in PROVIDER_PRESET_IDS', () => {
+    expect(PROVIDER_PRESET_IDS).toContain('fireworks');
+  });
+
+  it('uses the Anthropic-compatible base URL without a /v1 suffix', () => {
+    const preset = getPresetById('fireworks');
+    expect(preset?.baseUrl).toBe('https://api.fireworks.ai/inference');
+    expect(preset?.baseUrl.endsWith('/v1')).toBe(false);
+  });
+
+  it('pins a fully-qualified Fireworks model id as default', () => {
+    const preset = getPresetById('fireworks');
+    expect(preset?.defaultModel).toMatch(/^accounts\/fireworks\/(models|routers)\//);
+  });
+
+  it('validates fireworks preset requires API key with the fw_ placeholder', () => {
+    const preset = getPresetById('fireworks');
+    expect(preset?.requiresApiKey).toBe(true);
+    expect(preset?.apiKeyPlaceholder).toBe('fw_...');
+  });
+
+  it('treats fireworks as a valid preset id', () => {
+    expect(isValidPresetId('fireworks')).toBe(true);
+  });
+
+  it('handles whitespace in fireworks preset id', () => {
+    const preset = getPresetById('  fireworks  ');
+    expect(preset?.id).toBe('fireworks');
+  });
+
+  it('handles uppercase fireworks preset id', () => {
+    const preset = getPresetById('FIREWORKS');
+    expect(preset?.id).toBe('fireworks');
+  });
+
+  it('does not resolve partial or invalid fireworks ids', () => {
+    expect(getPresetById('fireworks-invalid')).toBeUndefined();
+    expect(isValidPresetId('fireworks-invalid')).toBe(false);
+  });
+});