[1] Add MCP (Model Context Protocol) server command (#1832)

* Add MCP (Model Context Protocol) server command

Implement `kubeshark mcp` command that runs an MCP server over stdio,
enabling AI assistants to query Kubeshark's network visibility data.

Features:
- MCP protocol implementation (JSON-RPC 2.0 over stdio)
- Dynamic tool discovery from Hub's /api/mcp endpoint
- Local cluster management tools (check_kubeshark_status, start_kubeshark, stop_kubeshark)
- --url flag for direct connection to existing Kubeshark deployment
- --kubeconfig flag for proxy mode with kubectl
- --allow-destructive flag to enable start/stop operations (safe by default)
- --list-tools flag to display available tools
- --mcp-config flag to generate MCP client configuration
- 5-minute cache TTL for Hub tools/prompts
- Prompts for common analysis tasks

* Address code review comments for MCP implementation

- Add 30s timeout to HTTP client to prevent hanging requests
- Add scanner.Err() check after stdin processing loop
- Close HTTP response bodies to prevent resource leaks
- Add goroutine to wait on started process to prevent zombies
- Simplify polling loop by removing ineffective context check
- Advertise check_kubeshark_status in URL mode (was callable but hidden)
- Update documentation to clarify URL mode only disables start/stop

* Fix lint errors in mcpRunner.go

- Use type conversion instead of struct literals for hubMCPTool -> mcpTool
  and hubMCPPromptArg -> mcpPromptArg (S1016 gosimple)
- Lowercase error string to follow Go conventions (ST1005 staticcheck)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

config/config.go

@@ -58,6 +58,7 @@ func InitConfig(cmd *cobra.Command) error {
 		"pro",
 		"manifests",
 		"license",
+		"mcp",
 	}, cmd.Use) {
 		go version.CheckNewerVersion()
 	}