Phase 3: Reorganize CLI with subcommand structure

Major Changes:
- Reorganized commands into logical groups (service, ups, group)
- Added new subcommand structure:
  - nupst service <enable|disable|start|stop|restart|status|logs|start-daemon>
  - nupst ups <add|edit|remove|list|test>
  - nupst group <add|edit|remove|list>
  - nupst config [show]
- Added --version/-v flag support
- Added restart subcommand for service
- Added command aliases (ls, rm)
- Renamed delete() to remove() in handlers
- Maintained backward compatibility with deprecation warnings
- Updated all help messages to reflect new structure
- Added showVersion(), showServiceHelp(), showUpsHelp() methods
- Fixed readline imports to use node:readline

Breaking Changes:
- Old command format (e.g. 'nupst add') is deprecated
- Users should migrate to new format (e.g. 'nupst ups add')
- Backward compatibility maintained with warnings for now

ts/cli/group-handler.ts

@@ -88,7 +88,7 @@ export class GroupHandler {
   public async add(): Promise<void> {
     try {
       // Import readline module for user input
-      const readline = await import('readline');
+      const readline = await import('node:readline');
 
       const rl = readline.createInterface({
         input: process.stdin,
@@ -198,7 +198,7 @@ export class GroupHandler {
   public async edit(groupId: string): Promise<void> {
     try {
       // Import readline module for user input
-      const readline = await import('readline');
+      const readline = await import('node:readline');
 
       const rl = readline.createInterface({
         input: process.stdin,
@@ -306,7 +306,7 @@ export class GroupHandler {
    * Delete an existing UPS group
    * @param groupId ID of the group to delete
    */
-  public async delete(groupId: string): Promise<void> {
+  public async remove(groupId: string): Promise<void> {
     try {
       // Try to load configuration
       try {
@@ -335,7 +335,7 @@ export class GroupHandler {
       const groupToDelete = config.groups[groupIndex];
       
       // Get confirmation before deleting
-      const readline = await import('readline');
+      const readline = await import('node:readline');
       const rl = readline.createInterface({
         input: process.stdin,
         output: process.stdout,

ts/cli/ups-handler.ts

@@ -24,7 +24,7 @@ export class UpsHandler {
   public async add(): Promise<void> {
     try {
       // Import readline module for user input
-      const readline = await import('readline');
+      const readline = await import('node:readline');
 
       const rl = readline.createInterface({
         input: process.stdin,
@@ -155,7 +155,7 @@ export class UpsHandler {
   public async edit(upsId?: string): Promise<void> {
     try {
       // Import readline module for user input
-      const readline = await import('readline');
+      const readline = await import('node:readline');
 
       const rl = readline.createInterface({
         input: process.stdin,
@@ -284,7 +284,7 @@ export class UpsHandler {
    * Delete a UPS by ID
    * @param upsId ID of the UPS to delete
    */
-  public async delete(upsId: string): Promise<void> {
+  public async remove(upsId: string): Promise<void> {
     try {
       // Try to load configuration
       try {
@@ -318,7 +318,7 @@ export class UpsHandler {
       const upsToDelete = config.upsDevices[upsIndex];
       
       // Get confirmation before deleting
-      const readline = await import('readline');
+      const readline = await import('node:readline');
       const rl = readline.createInterface({
         input: process.stdin,
         output: process.stdout,