feat: Enhanced Nextcloud template with Redis, automated config, and improved setup

[Eetezadi]

Summary

• Updated Nextcloud template from AIO version to stable Docker image with proper multi-service setup
• Added Redis for caching (APCu local, Redis distributed/locking)
• Created automated configuration script (fix-nextcloud.sh) for post-setup optimization
• Fixed MariaDB version pinning (10.11) for stability
• Improved environment variable handling with better secrets management
• Added proper service dependencies and networking
• Updated metadata with correct logo and description

Changes

• Docker Compose: Refactored to use nextcloud:stable with separate MariaDB 10.11 and Redis Alpine containers
• Configuration Script: Added automated script that handles:
  • Trusted proxy configuration for reverse proxy support
  • HTTPS protocol override
  • Regional settings and maintenance windows
  • Performance optimizations (database repair, missing indices)
  • Redis caching configuration
• Template: Enhanced template.toml with proper variable handling, environment configuration, and file mount for the setup script
• Metadata: Updated logo from SVG to PNG and corrected template description

[github-actions]

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Name	Status	Preview	Last Commit
templates	✅ Ready (View Log)	Visit Preview	1a96f6a