修复订阅授权返回后生成中断

生成动作先进入拼图进度页并立即发起生成

订阅授权改为非阻塞尝试，避免闪回卡住提交

移除订阅结果回写 web-view URL 导致回首页的逻辑

更新小程序订阅消息授权与发送边界文档

miniprogram/pages/subscribe-message/index.test.js

@@ -79,32 +79,6 @@ describe('subscribe-message mini program bridge', () => {
     expect(globalThis.wx.navigateBack).toHaveBeenCalled();
   });
 
-  test('auto request starts subscribe popup on page load', () => {
-    vi.useFakeTimers();
-    globalThis.wx.requestSubscribeMessage.mockImplementationOnce((options) => {
-      options.success?.({
-        m5z7BkkBhJGbcH0cdDeHaeRU2tViDEguP38XdrRRCdU: 'accept',
-      });
-    });
-    const page = createSubscribeMessagePage(
-      {
-        setData: vi.fn(),
-      },
-      { templateId: TEST_TEMPLATE_ID },
-    );
-
-    page.onLoad({ requestId: 'request-auto', autoRequest: '1' });
-    vi.runAllTimers();
-
-    expect(globalThis.wx.requestSubscribeMessage).toHaveBeenCalledWith({
-      tmplIds: [TEST_TEMPLATE_ID],
-      success: expect.any(Function),
-      fail: expect.any(Function),
-    });
-    expect(globalThis.wx.navigateBack).toHaveBeenCalled();
-    vi.useRealTimers();
-  });
-
   test('appendSubscribeResult replaces stale subscribe hash', () => {
     expect(
       appendSubscribeResult(