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>

claude_config_example.json

@@ -1,8 +1,7 @@
 {
   "mcpServers": {
     "gemini": {
-      "command": "/path/to/gemini-mcp-server/venv/bin/python",
-      "args": ["/path/to/gemini-mcp-server/gemini_server.py"],
+      "command": "/path/to/gemini-mcp-server/run_gemini.sh",
       "env": {
         "GEMINI_API_KEY": "your-gemini-api-key-here"
       }