feat: add version checking capability to MCP server

- Add version metadata (__version__, __updated__, __author__)
- Create get_version tool that returns server information
- Include Python version, start time, and configuration details
- Add comprehensive tests for version functionality
- Update existing tests to handle new tool count

Now you can check the server version from Claude by asking:
"Can you get the version of the Gemini MCP server?"

Version: 2.2.0
Updated: 2025-06-08
Author: Fahad Gilani

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

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

tests/test_gemini_server.py

@@ -139,12 +139,13 @@ class TestToolHandlers:
     async def test_handle_list_tools(self):
         """Test listing available tools"""
         tools = await handle_list_tools()
-        assert len(tools) == 3
+        assert len(tools) == 4  # Updated to include get_version
         
         tool_names = [tool.name for tool in tools]
         assert "chat" in tool_names
         assert "analyze_code" in tool_names
         assert "list_models" in tool_names
+        assert "get_version" in tool_names
     
     @pytest.mark.asyncio
     async def test_handle_call_tool_unknown(self):