fix: use proper ServerCapabilities for InitializationOptions

- Replaced plain dict capabilities with proper ServerCapabilities object
- Added proper imports for ServerCapabilities and ToolsCapability from mcp.types
- Now correctly declares tools capability using ToolsCapability() instead of empty dict
- This follows the MCP protocol specification for server capability declaration

The previous implementation used {"tools": {}} which was not the correct way
to declare tool capabilities according to the MCP Python SDK. This fix ensures
proper capability negotiation during MCP client connection initialization.

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

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

server.py

@@ -28,7 +28,7 @@ from typing import Any
 from mcp.server import Server
 from mcp.server.models import InitializationOptions
 from mcp.server.stdio import stdio_server
-from mcp.types import TextContent, Tool
+from mcp.types import ServerCapabilities, TextContent, Tool, ToolsCapability
 
 from config import (
     GEMINI_MODEL,
@@ -227,7 +227,9 @@ async def main():
             InitializationOptions(
                 server_name="gemini",
                 server_version=__version__,
-                capabilities={"tools": {}},  # Advertise tool support capability
+                capabilities=ServerCapabilities(
+                    tools=ToolsCapability()  # Advertise tool support capability
+                ),
             ),
         )