fix(config): align default.yaml with server schema

src/cli/doctor.test.ts

@@ -72,6 +72,28 @@ telegram:
     expect(configValidates?.status).toBe('fail');
   });
 
+  it('warns when deprecated server.tailscale_only key is present', async () => {
+    mkdirSync(testDir, { recursive: true });
+    const configPath = join(testDir, 'config.yaml');
+    writeFileSync(configPath, `
+telegram:
+  bot_token: "test-token"
+  allowed_chat_ids: [123]
+server:
+  tailscale_only: true
+models:
+  default:
+    provider: anthropic
+    model: claude-sonnet
+`);
+
+    const ctx: DoctorContext = { configPath, dataDir: testDir };
+    const results = await runChecks(ctx);
+
+    const deprecated = results.find(r => r.label.includes('deprecated keys'));
+    expect(deprecated?.status).toBe('warn');
+  });
+
   it('reports PASS for writable data directory', async () => {
     mkdirSync(testDir, { recursive: true });
     const configPath = join(testDir, 'config.yaml');