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.py

@@ -19,6 +19,12 @@ from .._core import (
     _sdcard_root, _app_data_dir, _package_name,
 )
 
+try:
+    from .._linux_impl import IS_LINUX, LinuxNotify, LinuxShell, LinuxProcess, LinuxDisplay, LinuxUIAutomation, LinuxPower
+    _USE_LINUX = IS_LINUX
+except ImportError:
+    _USE_LINUX = False
+
 
 # ═══════════════════════════════════════════════════════════════
 # Intent
@@ -834,10 +840,16 @@ class NotificationManager(Stub):
 
     def notify(self, id_: int, notification: Notification):
         self._notifications[id_] = notification
-        sys.stderr.write(
-            f"[NotificationManager] notify id={id_}: "
-            f"title={notification._title} text={notification._text}\n"
-        )
+        if _USE_LINUX:
+            title = getattr(notification, "_title", "") or ""
+            text = getattr(notification, "_text", "") or ""
+            if title or text:
+                LinuxNotify.send(title, text)
+        else:
+            sys.stderr.write(
+                f"[NotificationManager] notify id={id_}: "
+                f"title={notification._title} text={notification._text}\n"
+            )
 
     def notifyAsPackage(self, package_name: str, tag: Optional[str], id_: int, notification: Notification):
         self.notify(id_, notification)
@@ -1821,6 +1833,48 @@ class Activity(Stub):
     def getTheme(self):
         return getattr(self, '_theme', 0)
 
+    def getDeviceInfo(self):
+        """获取设备信息"""
+        if _USE_LINUX:
+            return LinuxProcess.get_system_info()
+        return {}
+
+    def executeShell(self, command):
+        """执行 Shell 命令"""
+        if _USE_LINUX:
+            return LinuxShell.exec(command)
+        return {"success": False, "output": "Shell not available"}
+
+    def screenshot(self, path=None):
+        """截屏"""
+        if _USE_LINUX:
+            return LinuxDisplay.screenshot(path)
+        return None
+
+    def getScreenSize(self):
+        """获取屏幕尺寸"""
+        if _USE_LINUX:
+            return LinuxDisplay.get_screen_size()
+        return (1920, 1080)
+
+    def click(self, x, y):
+        """点击屏幕坐标"""
+        if _USE_LINUX:
+            return LinuxUIAutomation.click(x, y)
+        return False
+
+    def typeText(self, text):
+        """输入文本"""
+        if _USE_LINUX:
+            return LinuxUIAutomation.type_text(text)
+        return False
+
+    def pressKey(self, key):
+        """按键"""
+        if _USE_LINUX:
+            return LinuxUIAutomation.press_key(key)
+        return False
+
 
 # ═══════════════════════════════════════════════════════════════
 # Service
@@ -2009,9 +2063,13 @@ class ActivityManager(Stub):
         self._memory_info = self.MemoryInfo()
 
     def getMemoryInfo(self) -> "ActivityManager.MemoryInfo":
+        if _USE_LINUX:
+            return LinuxPower.get_memory_info()
         return self._memory_info
 
     def getRunningAppProcesses(self) -> Optional[List["ActivityManager.RunningAppProcessInfo"]]:
+        if _USE_LINUX:
+            return LinuxProcess.list_processes()
         return []
 
     def killBackgroundProcesses(self, package_name: str):