Update launcher with dependency checking and global input capture info

clients/start_nfc_client.bat

@@ -1 +1,28 @@
-$(cat /tmp/nfc_client_extracted/start_nfc_client.bat)
+@echo off
+echo ============================================
+echo NFC Network Client Launcher
+echo Global Input Capture Enabled
+echo ============================================
+echo.
+
+REM Check if pynput is installed
+python -c "import pynput" 2>nul
+if errorlevel 1 (
+    echo ERROR: pynput not installed!
+    echo.
+    echo Installing required packages...
+    pip install -r client_requirements.txt
+    echo.
+    if errorlevel 1 (
+        echo Installation failed. Please install manually:
+        echo   pip install pynput requests
+        pause
+        exit /b 1
+    )
+)
+
+echo Starting NFC Network Client...
+echo Scans will be captured even when window is not focused
+echo.
+python nfc_network_client.py
+pause