feat: add theme suggestion service and integrate with commands #75

[dermatz]

Feature: Theme name suggestions for invalid input

Closes #75

Summary

When users enter an incorrect theme name, MageForge now suggests similar themes using Levenshtein distance algorithm (like Symfony's command suggestions).

Before:

bin/magento mageforge:theme:build vendor/Nema
# Error: Theme vendor/Nema is not installed.

After:

bin/magento mageforge:theme:build hyva/deFAULT

[ERROR] Theme 'hyva/deFAULT' is not installed.

? Did you mean one of these themes?
  ❯ Hyva/default
    None of these

✓ Using theme: Hyva/default

Changes

• Added ThemeSuggester service with Levenshtein matching (threshold: strlen/3) and case-insensitive substring matching
• Extended AbstractCommand with handleInvalidThemeWithSuggestions() method
• Updated 4 commands: BuildCommand, WatchCommand, CleanCommand, TokensCommand
• Interactive mode: Shows Laravel Prompts SelectPrompt with suggestions
• Non-interactive mode (CI/Docker): Displays suggestions as text
• Added CI tests in magento-compatibility.yml