Refactor, Modernize, and Document (#6)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a modular addon system for cluster management, enabling
streamlined installation and configuration of components like
cert-manager, Traefik, ClusterIssuer, Gitea, Prometheus, and Linkerd.
- Added a new Traefik dashboard service for improved monitoring and
access.
- Enhanced test environment script with flexible multinode and teardown
options.

- **Bug Fixes**
  - Improved uninstall confirmation prompts for better user clarity.

- **Documentation**
  - Expanded README with detailed instructions on adding new addons.

- **Chores**
  - Updated license to reflect organizational ownership.
  - Simplified dependency management for improved maintainability.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: urumo

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2025 Yuuki Wesp, Aram Hayrapetyan, "Argon Inc. LLC". All rights reserved.
+Copyright (c) 2025 "Argon Inc. LLC". All rights reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

bin/test_env.sh

@@ -1,22 +1,61 @@
 #!/usr/bin/env sh
 
-if ! command -v multipass &> /dev/null
-then
+# Usage:
+#   ./test_env.sh [--multinode] [--teardown]
+#
+# If --multinode is set, launches node1 and node2. Otherwise, launches node1 only.
+# If --teardown is set, deletes all multipass nodes and exits.
+
+set -e
+
+if ! command -v multipass >/dev/null 2>&1; then
   echo "Error: multipass could not be found. Please install multipass first."
   exit 1
 fi
 
-multipass launch --name node1 --cpus 2 --memory 2G --disk 20G
-multipass launch --name node2 --cpus 2 --memory 2G --disk 20G
+MULTINODE=0
+TEARDOWN=0
+for arg in "$@"
+do
+  case "$arg" in
+    --multinode) MULTINODE=1 ;;
+    --teardown) TEARDOWN=1 ;;
+  esac
+done
+
+if [ "$TEARDOWN" -eq 1 ]; then
+  echo "Deleting all multipass nodes..."
+  NODES=$(multipass list --format csv | awk -F, 'NR>1 {print $1}')
+  if [ -n "$NODES" ]; then
+    multipass delete $NODES --purge
+  else
+    echo "No multipass nodes to delete."
+  fi
+  multipass list
+  exit 0
+fi
+
+if [ "$MULTINODE" -eq 1 ]; then
+  NODES="node1 node2"
+else
+  NODES="node1"
+fi
 
-PASS=${MPS_PASSWORD:-password123}
-multipass exec node1 -- sudo bash -c "echo ubuntu:${PASS} | sudo chpasswd"
-multipass exec node2 -- sudo bash -c "echo ubuntu:${PASS} | sudo chpasswd"
 
-for key in ~/.ssh/*.pub; do
-  multipass exec node1 -- bash -c "echo '$(cat "$key")' >> ~/.ssh/authorized_keys"
-  multipass exec node2 -- bash -c "echo '$(cat "$key")' >> ~/.ssh/authorized_keys"
+if [ "$MULTINODE" -eq 1 ]; then
+  MEMORY=2G
+else
+  MEMORY=4G
+fi
+
+for NODE in $NODES; do
+  multipass launch --name "$NODE" --cpus 2 --memory $MEMORY --disk 10G
+  PASS=${MPS_PASSWORD:-password123}
+  multipass exec "$NODE" -- sudo bash -c "echo ubuntu:${PASS} | sudo chpasswd"
+  for key in ~/.ssh/*.pub; do
+    multipass exec "$NODE" -- bash -c "echo '$(cat "$key")' >> ~/.ssh/authorized_keys"
+  done
+  echo "Node $NODE ready."
 done
 
 multipass info | grep "IPv4"
-

bin/test_teardown.sh

@@ -1,4 +1,3 @@
-// The main package for the k3sd CLI tool. Handles cluster creation, uninstallation, and logging.
 package main
 
 import (
@@ -9,66 +8,61 @@ import (
 	"os/exec"
 	"strings"
 
-	"github.com/argon-chat/k3sd/cluster"
-	"github.com/argon-chat/k3sd/utils"
+	. "github.com/argon-chat/k3sd/pkg/cluster"
+	clusterstore "github.com/argon-chat/k3sd/pkg/clusterstore"
+	. "github.com/argon-chat/k3sd/pkg/utils"
 )
 
-// main is the entry point for the k3sd CLI tool.
-// It parses command-line flags, loads cluster configuration, and either creates or uninstalls clusters.
-// It also sets up logging and saves the updated cluster state.
 func main() {
-	utils.ParseFlags()
+	ParseFlags()
 
-	if utils.VersionFlag {
-		fmt.Printf("K3SD version: %s\n", utils.Version)
+	if VersionFlag {
+		fmt.Printf("K3SD version: %s\n", Version)
 		os.Exit(0)
 	}
 
-	clusters, err := cluster.LoadClusters(utils.ConfigPath)
+	clusters, err := clusterstore.LoadClusters(ConfigPath)
 	if err != nil {
 		log.Fatalf("failed to load clusters: %v", err)
 	}
 
-	logger := utils.NewLogger("cli")
+	logger := NewLogger("cli")
 	go logger.LogWorker()
 	go logger.LogWorkerErr()
 	go logger.LogWorkerFile()
 	go logger.LogWorkerCmd()
 
 	checkCommandExists()
 
-	if utils.Uninstall {
-		// Prompt the user for confirmation before uninstalling clusters.
+	if Uninstall {
 		reader := bufio.NewReader(os.Stdin)
-		fmt.Print("Are you sure you want to uninstall the clusters? (yes/no): ")
+		fmt.Print("Are you sure you want to uninstall the clusters? (yes/y/no/n): ")
 		response, _ := reader.ReadString('\n')
 		response = strings.TrimSpace(strings.ToLower(response))
 
-		if response == "yes" {
-			clusters, err = cluster.UninstallCluster(clusters, logger)
+		if response == "yes" || response == "y" {
+			clusters, err = UninstallCluster(clusters, logger)
 			if err != nil {
 				log.Fatalf("failed to uninstall clusters: %v", err)
 			}
-		} else {
+		} else if response == "no" || response == "n" {
 			fmt.Println("Uninstallation canceled.")
 			return
+		} else {
+			log.Fatalf("And just what do you mean by %s?", response)
 		}
 	} else {
-		// Create or update clusters as specified in the configuration.
-		clusters, err = cluster.CreateCluster(clusters, logger, []string{})
+		clusters, err = CreateCluster(clusters, logger, []string{})
 		if err != nil {
 			log.Fatalf("failed to create clusters: %v", err)
 		}
 	}
 
-	// Save the updated cluster state to the configuration file.
-	if err := cluster.SaveClusters(utils.ConfigPath, clusters); err != nil {
+	if err := clusterstore.SaveClusters(ConfigPath, clusters); err != nil {
 		log.Fatalf("failed to save clusters: %v", err)
 	}
 }
 
-// checkCommandExists verifies that all required external commands are available in the system's PATH.
-// If any command is missing, the program will terminate with a fatal error.
 func checkCommandExists() {
 	commands := []string{
 		"linkerd",