Add search support for process list in binding page

[Kill1ngPig]

为窗口绑定页面左侧“现有窗口进程”列表增加搜索功能，支持按进程名或窗口标题进行动态过滤，清空搜索后可恢复完整列表。

为保证搜索与原有添加/删除绑定、刷新进程等逻辑的一致性，引入了左侧完整窗口数据缓存 left_all_windows。搜索时基于缓存数据进行过滤，并统一通过 InsertTreeList() 重新渲染列表，而不直接操作树控件。

这样可以确保搜索始终基于完整数据，同时避免在多种操作场景下出现数据不一致的问题。部分实现了issue #113 。本次修改仅涉及搜索功能，不包含默认展开/收起行为的调整。

[Copilot]

Pull request overview

Adds search/filtering to the left-side “现有窗口进程” list on the binding page by introducing a cached full dataset and re-rendering the tree based on the current search keyword.

Changes:

• Added a wx.SearchCtrl above the left process/window list and wired it to filter dynamically.
• Introduced left_all_windows cache and centralized left-list rendering through ApplyLeftFilter() + InsertTreeList().
• Updated add/remove binding flows to keep the left cache in sync and re-apply the current filter.

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