Initial commit: M20 Gamepad control app

山猫 M20 四足机器人手柄控制 Android App，使用 UDP + JSON 协议控制机器人运动。

- 协议层：16 字节小端 Header + JSON ASDU 编解码
- 网络层：UDP 客户端，心跳 1Hz，断线检测 3s
- 连接状态机：空闲/连接中/已连接/断线 + 运动状态机：空闲/站立/RL 控制
- 虚拟摇杆：Compose 原生摇杆库，angle/power -> X/Y/Yaw 映射
- 视频播放：Media3 ExoPlayer RTSP，支持 AUTO/FORCE_HW/FORCE_SW_H264/FORCE_SW_H265
- 设置界面：机器人 IP/端口、RTSP 地址、编码器选择，DataStore 持久化
- 状态面板：异常列表、运控状态、设备温度、电池信息
- 控制按钮：模式/步态/照明/充电/休眠

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile