feat: implement unified dot command interface

Add modern `dot <action> [subaction] [flags]` command structure to replace
fragmented legacy commands. Provides intuitive, self-documenting CLI with
comprehensive help system and error handling.

New commands:
- dot sync [status|on|off|--force]
- dot packages [list|install|check|update|status|check-updates]
- dot profile [show|set <name>|detect]
- dot reset [--soft|--hard|--nuclear]
- dot help, dot version

Features:
- Colored output with clear error messages
- Auto-sources required functions
- Short aliases supported (e.g. 'pkg' for 'packages')
- Removes all legacy dotcommand aliases for clean codebase

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

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

shared/aliases

@@ -61,33 +61,8 @@ alias myip='curl ifconfig.me'
 alias path='echo $PATH | tr ":" "\n"'
 alias reload='exec $SHELL'
 
-# Dotfiles sync aliases
-alias dotsync='dotfiles_sync_now'
-alias dotsyncforce='dotfiles_sync_force'
-alias dotstatus='dotfiles_sync_status'
-alias dotson='dotfiles_sync_enable'
-alias dotsoff='dotfiles_sync_disable'
-
-# Package management aliases
-alias dotpkgs='dotfiles_packages_status'
-alias dotinstall='dotfiles_install_packages'
-alias dotcheck='dotfiles_check_packages'
-
-# Profile management aliases
-alias dotprofile='dotfiles_profile_status'
-alias dotprofileset='dotfiles_profile_set'
-alias dotprofiledetect='dotfiles_profile_detect'
-
-# Reset aliases
-alias dotreset='$HOME/.dotfiles/reset.sh'
-alias dotresetsoft='$HOME/.dotfiles/reset.sh --soft'
-alias dotresethard='$HOME/.dotfiles/reset.sh --hard'
-alias dotresetnuke='$HOME/.dotfiles/reset.sh --nuclear'
-
-# Update aliases
-alias dotupdatecheck='dotfiles_update_check'
-alias dotupdatestatus='dotfiles_update_status'
-alias dotupdate='dotfiles_update_install'
+# Modern Dotfiles Management - Unified Command Interface
+alias dot='$HOME/.dotfiles/shared/dot-command'
 
 # Task Master aliases
 alias tm='task-master'