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/view.py

@@ -10,6 +10,12 @@ from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 from .._core import Stub, AndroidOnlyError, android_context, HAS_PYAUTOGUI
 
+try:
+    from .._linux_impl import IS_LINUX, LinuxDisplay, LinuxUIAutomation, HAS_XDOTOOL
+    _USE_LINUX = IS_LINUX
+except ImportError:
+    _USE_LINUX = False
+
 
 # ═══════════════════════════════════════════════════════════════
 # Gravity
@@ -363,6 +369,12 @@ class View(Stub):
     def performClick(self) -> bool:
         return self.callOnClick()
 
+    def screenshot(self, path=None):
+        """截屏"""
+        if _USE_LINUX:
+            return LinuxDisplay.screenshot(path)
+        return None
+
     def performLongClick(self) -> bool:
         if self._on_long_click_listener:
             self._on_long_click_listener(self)
@@ -3260,9 +3272,13 @@ class Display(Stub):
         return self._display_id
 
     def getWidth(self) -> int:
+        if _USE_LINUX:
+            return LinuxDisplay.get_screen_size()[0]
         return self._width
 
     def getHeight(self) -> int:
+        if _USE_LINUX:
+            return LinuxDisplay.get_screen_size()[1]
         return self._height
 
     def getRotation(self) -> int: