Add API vs Coding Plan mode selection for Z.AI auth

src/cli/zai-auth.test.ts

@@ -60,7 +60,7 @@ describe('zai-auth command', () => {
 
   it('re-prompts and stores new key when credential exists and user answers yes', async () => {
     mockLoadStoredZaiAuth.mockReturnValue({ api_key: 'existing-key', created_at: '2026-02-16T00:00:00.000Z' });
-    mockReadlineAnswers(['y', 'new-zai-key']);
+    mockReadlineAnswers(['y', '1', 'new-zai-key']);
 
     const program = new Command();
     const { registerZaiAuthCommand } = await import('./zai-auth.js');
@@ -77,4 +77,24 @@ describe('zai-auth command', () => {
     consoleLog.mockRestore();
     consoleError.mockRestore();
   });
+
+  it('supports --mode plan without interactive mode selection', async () => {
+    mockLoadStoredZaiAuth.mockReturnValue(null);
+    mockReadlineAnswers(['new-zai-plan-key']);
+
+    const program = new Command();
+    const { registerZaiAuthCommand } = await import('./zai-auth.js');
+    registerZaiAuthCommand(program);
+
+    const consoleLog = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => undefined);
+
+    await program.parseAsync(['node', 'test', 'zai-auth', '--mode', 'plan']);
+
+    expect(mockStoreZaiAuth).toHaveBeenCalledWith('new-zai-plan-key');
+    expect(consoleError).not.toHaveBeenCalled();
+
+    consoleLog.mockRestore();
+    consoleError.mockRestore();
+  });
 });