Add installation fix script for Windows

fix_installation.bat

@@ -0,0 +1,47 @@
+@echo off
+echo ======================================
+echo Dolibarr MCP Installation Fix
+echo ======================================
+echo.
+echo Fixing installation and module paths...
+echo.
+
+REM Check if virtual environment exists
+if not exist "venv_dolibarr" (
+    echo Creating virtual environment...
+    python -m venv venv_dolibarr
+)
+
+echo Activating virtual environment...
+call venv_dolibarr\Scripts\activate
+
+echo Installing package in development mode...
+pip install -e .
+
+echo.
+echo Testing installation...
+python -c "import sys; sys.path.insert(0, 'src'); from dolibarr_mcp import __version__; print(f'Dolibarr MCP version: {__version__}')" 2>NUL
+if %errorlevel% neq 0 (
+    echo.
+    echo Installation check failed. Trying alternative fix...
+    
+    REM Install requirements directly
+    pip install requests python-dotenv mcp
+    
+    REM Create a simple test
+    python -c "import sys; print('Python path:'); [print(f'  {p}') for p in sys.path[:5]]"
+    
+    echo.
+    echo Now testing module import with path fix...
+    python mcp_server_launcher.py
+) else (
+    echo Installation successful!
+    echo.
+    echo You can now run the server with:
+    echo   python -m dolibarr_mcp.dolibarr_mcp_server
+    echo OR
+    echo   python mcp_server_launcher.py
+)
+
+echo.
+pause