feat: Linux 真实实现层 — 从存根库变为可用生产力工具

新增 _linux_impl.py (800+行):
- LinuxNetwork: 真实IP/接口/DNS/网关/MAC (ip命令+/proc/net)
- LinuxBluetooth: 真实蓝牙状态/扫描/配对/连接 (bluetoothctl)
- LinuxSensors: 真实温度/CPU频率/风扇 (/sys/class/hwmon)
- LinuxAudio: 真实音量控制/静音 (amixer)
- LinuxClipboard: 真实剪贴板读写 (xclip+tkinter回退)
- LinuxPower: 真实CPU/内存/电池 (psutil+/sys/class/power_supply)
- LinuxLocation: 真实IP地理定位 (ip-api.com)
- LinuxNotify: 真实桌面通知 (notify-send)
- LinuxDisplay: 真实屏幕尺寸/截屏/鼠标位置 (xdotool+X11)
- LinuxUIAutomation: 真实点击/输入/按键/滚动 (xdotool)
- LinuxCamera: 真实摄像头拍照 (opencv/V4L2)
- LinuxProcess: 真实进程列表/系统信息/应用管理 (psutil+/proc)
- LinuxShell: 真实命令执行 (subprocess)

改造10+核心类使用Linux真实实现:
- BluetoothAdapter/SensorManager/AudioManager
- ConnectivityManager/WifiManager/TelephonyManager
- LocationManager/PowerManager/BatteryManager/Build
- ActivityManager/Activity/Toast/Display/ClipboardManager
- NotificationManager

15项真实行为测试全部通过:
- 真实IP: 10.60.218.244
- 真实位置: 北京 39.9042, 116.407
- 真实主机名: work-41-vci-g427c
- 真实内核: 5.15.120.byteatom-ck.14
- 真实内存: 1.8GB/3.8GB
- 真实进程列表

android_pyapi/android/media.py

@@ -13,6 +13,13 @@ from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Union
 from .._core import Stub, AndroidOnlyError, android_context, HAS_PIL, HAS_PYMUPDF, resolve_android_path
 from .graphics import PointF
 
+# Linux 真实实现导入
+try:
+    from .._linux_impl import IS_LINUX, LinuxAudio, HAS_AMIXER
+    _USE_LINUX = IS_LINUX
+except ImportError:
+    _USE_LINUX = False
+
 
 # ═══════════════════════════════════════════════════════════════
 # AudioAttributes
@@ -596,15 +603,37 @@ class AudioManager(Stub):
         self._parameters: Dict[str, str] = {}
 
     def getStreamVolume(self, streamType: int) -> int:
+        if _USE_LINUX:
+            # STREAM_MUSIC 及其它流类型映射到 Linux 主音量
+            return LinuxAudio.get_volume()
         return self._stream_volumes.get(streamType, 0)
 
     def getStreamMaxVolume(self, streamType: int) -> int:
+        if _USE_LINUX:
+            return 100
         return 15
 
     def setStreamVolume(self, streamType: int, index: int, flags: int = 0):
+        if _USE_LINUX:
+            # STREAM_MUSIC 及其它流类型映射到 Linux 主音量
+            LinuxAudio.set_volume(index)
+            return
         if streamType in self._stream_volumes:
             self._stream_volumes[streamType] = max(0, min(15, index))
 
+    def isMicrophoneMute(self) -> bool:
+        """麦克风是否静音"""
+        if _USE_LINUX:
+            return LinuxAudio.get_mute()
+        return False
+
+    def setMicrophoneMute(self, on: bool):
+        """设置麦克风静音"""
+        if _USE_LINUX:
+            LinuxAudio.set_mute(on)
+            return
+        # 存根: 无操作
+
     def adjustVolume(self, direction: int, flags: int = 0):
         pass