feat: implement tier-a4 tts voice output replies

src/config/schema.test.ts

@@ -660,6 +660,49 @@ describe('configSchema — audio talk mode', () => {
   });
 });
 
+describe('configSchema — tts', () => {
+  const minimalConfig = {
+    telegram: { bot_token: 'test', allowed_chat_ids: [1] },
+    models: { default: { provider: 'anthropic', model: 'claude-3' } },
+  };
+
+  it('defaults tts fields', () => {
+    const result = configSchema.parse(minimalConfig);
+    expect(result.tts.enabled).toBe(false);
+    expect(result.tts.enabled_channels).toEqual([]);
+    expect(result.tts.provider).toBeUndefined();
+  });
+
+  it('accepts custom tts provider settings', () => {
+    const result = configSchema.parse({
+      ...minimalConfig,
+      tts: {
+        enabled: true,
+        enabled_channels: ['telegram', 'discord'],
+        provider: {
+          type: 'custom',
+          endpoint: 'https://example.com/v1/audio/speech',
+          api_key: 'sk-test',
+          model: 'gpt-4o-mini-tts',
+          voice: 'nova',
+          format: 'wav',
+        },
+      },
+    });
+
+    expect(result.tts.enabled).toBe(true);
+    expect(result.tts.enabled_channels).toEqual(['telegram', 'discord']);
+    expect(result.tts.provider).toMatchObject({
+      type: 'custom',
+      endpoint: 'https://example.com/v1/audio/speech',
+      api_key: 'sk-test',
+      model: 'gpt-4o-mini-tts',
+      voice: 'nova',
+      format: 'wav',
+    });
+  });
+});
+
 describe('configSchema — mattermost', () => {
   const minimalConfig = {
     telegram: { bot_token: 'test', allowed_chat_ids: [1] },