feat: add comprehensive Windows/WSL support and documentation

Major improvements for Windows users:
- Add detailed Windows Setup Guide with native and WSL options
- Create platform-specific example configurations (Windows/WSL/macOS)
- Add troubleshooting section addressing common Windows/WSL errors
- Create test_wsl_setup.bat diagnostic script for Windows users

Script improvements:
- Enhance run_gemini.bat with error handling and helpful messages
- Update both run scripts to use server.py as main entry point
- Keep gemini_server.py as backward compatibility wrapper

Documentation:
- Add clear instructions for both native Windows and WSL setups
- Explain the wsl.exe bridge approach for WSL users
- Include performance recommendations for WSL file access
- Add specific troubleshooting for spawn ENOENT errors

All tests passing, code properly formatted and linted.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

run_gemini.sh

@@ -16,4 +16,4 @@ else
 fi
 
 # Run the server
-exec "$PYTHON_EXEC" "$SCRIPT_DIR/gemini_server.py"
+exec "$PYTHON_EXEC" "$SCRIPT_DIR/server.py"