2.1.6：静默自动更新 + 远程鼠标控制 + 一键显示桌面

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用户这次提了一整套升级。这个提交先落地三块（其余几块在做）。

== 一、静默自动更新 ==

用户原话："手表端点击一个更新按钮，电脑端就可以自动进行静默更新，
其他什么设置都不变 …… 不弹任何窗口出来"。

链路：

    手表点按钮 -> 被控端问中转"最新是哪版"
               -> 下载到 %TEMP%\ykxmz-update\
               -> 校验 sha256
               -> 起一个**分离的 .cmd 帮手**
               -> 自己退出
               -> 帮手等它退出 -> 静默跑安装器 -> 重新拉起

关键设计说明：

  * **为什么要有那个 .cmd 帮手**：Windows 上正在运行的 exe 是锁着的，
    安装器覆盖不了，所以必须"先退出、再装、再起来"，而这三步
    不能由被控端自己做（它一退出就没人执行后面的了）。
    用 DETACHED_PROCESS 起的助手不受父进程退出影响。

  * **配置为什么不会丢**：配置在 %ProgramData%\ykxmz\data\，
    **不在程序目录里**。安装器升级只替换 {app} 下的文件，
    不碰 ProgramData —— 中转地址、配对码、各种开关原样保留。
    这是这个功能能做的前提。

  * **更新源是用户自己的中转站**，不是作者的服务器，也不是任何
    写死的公网地址。被控端问的是它自己配置的那个地址。
    中转没有这个接口（老版本服务端）时会明确提示"先手动升级一次服务端"。

  * **sha256 必须校验**：自更新最大的风险是下到一半断了或被换了，
    装上去是个坏程序、而且它还会自己再更新 —— 螺旋下去很难救。
    对不上就**放弃这一轮**，保持现状（现状至少能用）。

中转新增：GET /v1/update/latest?platform=windows
返回 version / name / url / size / sha256。版本比较按**数字段**
（不能按字符串，否则 "1.9.0" > "2.1.4"）。sha256 按
(文件名,大小,mtime) 缓存，避免每次重算 9MB。

手表端："电脑端版本：点这里查看" 按钮，查完显示
"电脑端 2.1.4 → 2.1.5（点这里更新）"，确认后才真的更新。

== 二、远程鼠标控制 ==

新增 windows/lanremote/input.py，用 SendInput 模拟鼠标键盘。

  * **为什么用 SendInput 而不是 mouse_event**：后者是 Win95 时代的
    API，会被 UIPI 拦，而且没有 dwExtraInfo（多个注入源会互相干扰）。
    SendInput 还能一次打包多个事件，按下+抬起之间不会插进别的输入。

  * **坐标是 0..65535 归一化**，而且**必须除以 (屏幕宽-1)**。
    少了那个 -1，最右边和最下边几像素点不到 —— 表现为
    "鼠标到不了屏幕边缘"，任务栏在底下的机器上尤其明显。

  * **INPUT 结构在 32/64 位下大小不同**（28 / 40），
    ctypes 里按进程位数算，不能写死。

  * 权限说明：目标窗口如果是管理员权限的（UAC 提升过的），
    普通权限的注入会被 UIPI 拦掉。这不是 bug，是 Windows 的设计。
    被控端以管理员运行就都能点。

== 三、一键显示桌面 ==

用户要求快捷栏里那个"不能改"的按钮就是这个功能，等于 Win+D。
和鼠标控制共用 input.py。

== 顺手修的一个自己造的坑 ==

往 server.py 插方法时，**两次**把 dispatch 的兜底
`return {"ok": False, "error": f"未知命令: {cmd}"}` 一起卷进了新方法里：

  * pyflakes 报 "undefined name 'cmd'"
  * 而且 dispatch 丢了兜底分支（未知命令会返回 None）

第一次靠 pyflakes 抓到，第二次也是。为了以后不再犯，
`_tests/test_update_flow.py` 里加了**结构断言**：
兜底必须在带 CMD_UPDATE 的那个方法体里，而各新方法里不能出现它。

（那条断言第一版写得太死 —— 要求"紧跟 CMD_UPDATE 分支"，
 后来往 dispatch 里插了新分支就误报了。改成验结构真相。）

== 验证 ==

    全量回归（含新增的 3a10 / 3a11 两关）全部 PASS
    静默自动更新：协议 + updater 15 项 + 服务端结构 8 项
    远程鼠标：坐标归一化 / 滚轮夹取 / Win+D 事件顺序 / 非法参数 22 项
    610 个 Python 文件语法通过
    实际注入鼠标成功（move / click / scroll / show_desktop）

== 还没做的（下一批） ==

    手表顶部快捷栏（可自定义最多 4 个，1 个固定"显示桌面"）
    屏幕镜像去掉提示条、去掉所有弹窗
    托盘图标改成设置项
    「允许新设备连接」开关（中转后台 + 安卓端）
    弹文字窗口位置/大小可自定义
    中转后台设备列表显示版本 + 远程点更新

== 顺手清理 ==

_tests/out_app/ 下面那堆 .class 是 Java 编译检查的产物，
以前误提交进仓库了（152 个文件）。这次从索引里移除并加进 .gitignore。

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