Fix MCP Hub API tool call field name (#1842)

The Hub API expects 'name' field but the MCP server was sending 'tool'.
This caused all Hub-forwarded tools (list_l4_flows, get_l4_flow_summary,
list_api_calls, etc.) to fail with 'tool name is required' error.

Local tools like check_kubeshark_status were unaffected as they don't
call the Hub API.

cmd/mcpRunner.go

@@ -671,7 +671,7 @@ func (s *mcpServer) callHubTool(toolName string, args map[string]any) (string, b
 
 	// Build the request body
 	requestBody := map[string]any{
-		"tool":      toolName,
+		"name":      toolName,
 		"arguments": args,
 	}