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/app_tasks.py

@@ -13,6 +13,12 @@ from typing import Any, Callable, Dict, List, Optional, Tuple
 
 from .._core import Stub, AndroidOnlyError
 
+try:
+    from .._linux_impl import IS_LINUX, LinuxProcess, LinuxPower
+    _USE_LINUX = IS_LINUX
+except ImportError:
+    _USE_LINUX = False
+
 __all__ = [
     "TaskManager", "TaskInfo", "TaskStackListener", "TaskSnapshot",
     "TaskDescription", "ActivityManager",
@@ -908,9 +914,18 @@ class ActivityManager(Stub):
         return list(self._services.values())[:maxNum]
 
     def getRunningAppProcesses(self) -> List[RunningAppProcessInfo]:
+        if _USE_LINUX:
+            return LinuxProcess.list_processes()
         return list(self._processes.values())
 
     def getMemoryInfo(self, outInfo: MemoryInfo):
+        if _USE_LINUX:
+            mem = LinuxPower.get_memory_info()
+            outInfo.availMem = mem.get("available", 0)
+            outInfo.totalMem = mem.get("total", 0)
+            outInfo.threshold = int(mem.get("total", 0) * 0.1)
+            outInfo.lowMemory = mem.get("percent", 0) > 90.0
+            return outInfo
         import psutil
         try:
             import psutil