feat(minapp): improve popup/tabs behavior (issue #984)

[Victory-Hugo]

Summary

This PR introduces a new MinApp feature to improve popup/tab behavior. It addresses a real user need that is currently blocking workflows and aligns with the existing issue #984. The implementation is functional and intended for urgent evaluation; it may require iteration and refinement.

摘要

本 PR 为 MinApp 增加了弹窗/标签行为相关的新功能改进，旨在解决当前阻塞用户工作流的实际需求，并与现有 issue #984 保持一致。当前实现已可用，因需求紧急先提交供评估，后续可能需要根据反馈继续完善。

Why / Motivation

• Addresses an urgent user need that is currently blocking workflow
• Related to issue [功能]: 标签页形式展现小程序页面；发送消息到多个ai api或者小程序窗口 #984

为什么 / 动机

• 解决当前阻塞用户工作流的紧急需求
• 与 issue [功能]: 标签页形式展现小程序页面；发送消息到多个ai api或者小程序窗口 #984 相关

Notes / Risks

• This is a feature addition; please pay special attention to edge cases during review
• I’m happy to follow up with fixes and improvements based on feedback

注意 / 风险

1. 这是新增功能，请在评审时重点关注边界情况与兼容性问题。
2. 为降低冲突风险，目前仅实现了“多小程序并排”的能力；请开发者进一步审查是否存在潜在问题。

[DeJeune]

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