feat: add type property to server tools in MCPService

- Enhanced the server tool structure by adding a `type` property set to 'mcp' for better identification and handling of tools within the MCPService.

src/main/services/MCPService.ts

@@ -425,7 +425,8 @@ class McpService {
           ...tool,
           id: buildFunctionCallToolName(server.name, tool.name),
           serverId: server.id,
-          serverName: server.name
+          serverName: server.name,
+          type: 'mcp'
         }
         serverTools.push(serverTool)
       })