Add controller alias mapping and fix ChildButton mouse binding persistence / 新增手柄别名映射并修复 ChildButton 鼠标绑定保存问题

[kingfen-wu]

Summary / 概要

Add controller alias support across the keymapping pipeline, and fix ChildButton so mouse button bindings are saved correctly.

补齐手柄别名在 keymapping 链路中的支持，并修复 ChildButton 保存鼠标按键绑定时出错的问题。

Changes / 改动内容

• add readable controller aliases with legacy short-name compatibility

• 新增可读手柄别名，并兼容旧短名

• register controller actions with both readable names and legacy aliases

• 运行时同时注册完整手柄名称和旧别名

• recognize Left Thumbstick and Right Thumbstick explicitly

• 显式识别 Left Thumbstick 和 Right Thumbstick

• allow draggable actions to use the bound input source instead of hardcoded mouse movement

• 让拖拽动作跟随绑定输入源，而不是写死为鼠标移动

• fix ChildButton mouse button bindings being restored as the wrong key after saving

• 修复 ChildButton 保存后鼠标按键绑定被错误还原的问题

Testing / 测试

• verified controller mappings can be saved and triggered

• 已验证手柄映射可以正确保存并触发

• verified draggable actions work with thumbstick-bound input

• 已验证拖拽动作可由绑定到摇杆的输入驱动

• verified mouse button bindings in ChildButton no longer change after saving

• 已验证 ChildButton 中的鼠标按键绑定保存后不再错误变化