feat: GitHub Sync Status with Intelligent Caching

[skerbis]

🚀 Features

GitHub Sync Status

• ✅ Smart Update Detection: Compare GitHub commit dates with REDAXO update dates
• ✅ Intelligent Buttons: Show 'Update' (orange) when GitHub is newer, 'Reload' (gray) when current
• ✅ Date Display: Show both GitHub and REDAXO dates in sync status column
• ✅ Support for Modules & Templates: Full sync tracking for both content types

Performance Optimization

• ✅ GitHubItemCache System: Efficient database-backed caching
• ✅ 1-hour Cache Lifetime: Minimize GitHub API requests
• ✅ Auto-Cache Update: Automatically refresh cache on install/update
• ✅ Rate Limit Friendly: Only check GitHub once per hour per item

Technical Changes

• 🆕 New GitHubItemCache class for cache management
• 🆕 Database table rex_github_installer_items for metadata storage
• 🆕 install.php and uninstall.php for table management
• 📝 Extended GitHubApi::getLastCommitDate() method
• 📝 Updated RepositoryManager::getModulesWithStatus() and getTemplatesWithStatus()
• 📝 Cache integration in NewInstallManager and UpdateManager
• 🌐 New translations: modules_update, modules_reload, template_sync_status

🎯 Version

• Version bump: 1.4.0 → 1.5.0

📸 UI Changes

• New 'Sync-Status' column in modules and templates tables
• Color-coded badges: Orange 'Update' vs Green 'Current'
• Timestamp display for last GitHub commit and REDAXO update

⚠️ Breaking Changes

None - fully backward compatible

📦 Database Migration

• Requires re-installation or table creation via install.php
• Safe to upgrade - no data loss

[Copilot]

Pull Request Overview

This PR introduces a comprehensive GitHub sync status feature with intelligent caching to track whether installed modules and templates are up-to-date with their GitHub repositories. The implementation adds visual indicators showing when updates are available and optimizes API usage through a 1-hour cache system.

Key changes:

• Database-backed caching system (GitHubItemCache) to minimize GitHub API requests
• Enhanced status tracking comparing GitHub commit dates with REDAXO update dates
• UI improvements with color-coded sync status badges and timestamp displays

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
install.php	Creates database table for GitHub item cache with proper indexes
uninstall.php	Handles cleanup by dropping cache table on addon removal
lib/GitHubItemCache.php	New cache manager class for storing and retrieving GitHub metadata
lib/GitHubApi.php	Added method to fetch last commit date for files/folders
lib/RepositoryManager.php	Extended module/template status methods to include sync information
lib/NewInstallManager.php	Integrated cache updates during fresh installations
lib/UpdateManager.php	Integrated cache updates during module/template updates
pages/modules.php	Added sync status column with date comparisons and smart button logic
pages/templates.php	Added sync status column with date comparisons and smart button logic
package.yml	Version bump from 1.4.0 to 1.5.0
lang/de_de.lang	German translations for new sync status features
lang/en_gb.lang	English translations for new sync status features

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