feat: Simplify configuration with run_gemini scripts

- Added run_gemini.sh for macOS/Linux
- Added run_gemini.bat for Windows
- Scripts handle virtual environment activation automatically
- Updated README and config examples to use the simpler command
- No need to specify Python path or script arguments anymore

This makes the setup much cleaner and less error-prone for users.

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

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

run_gemini.bat

@@ -0,0 +1,9 @@
+@echo off
+REM Windows batch script to run Gemini MCP server
+
+REM Get the directory where this script is located
+set SCRIPT_DIR=%~dp0
+
+REM Activate the virtual environment and run the server
+call "%SCRIPT_DIR%venv\Scripts\activate.bat"
+python "%SCRIPT_DIR%gemini_server.py"