fix: Resolve race condition in cache directory creation

[HecFranco]

🎯 Purpose

This PR fixes a race condition in cache directory creation that caused Warning: mkdir(): File exists errors, and includes minor improvements to Docker Compose configuration and .gitignore.

🔧 Changes

Fix Race Condition in Cache Directory Creation

• Fixed CleanTranslationCacheListener::isCacheExpired() method to handle concurrent directory creation
• Resolves Warning: mkdir(): File exists error that occurred when multiple processes tried to create the cache directory simultaneously
• Method now uses a safe pattern that:
  • Checks if directory exists
  • Attempts to create it with recursive mode (mkdir($cache_dir, 0777, true))
  • Re-checks if directory exists (in case another process created it)
  • Throws RuntimeException only if the directory truly cannot be created
• This prevents race condition warnings while ensuring proper error handling

Docker Compose Configuration

• Removed deprecated version: '3.8' declaration from docker-compose.yml
• Docker Compose v2+ no longer requires version declaration
• Streamlines configuration without affecting functionality

Gitignore Updates

• Added .docs and .demo directories to .gitignore
• Prevents tracking of documentation and demo files in the repository

✅ Testing

• No more Warning: mkdir(): File exists errors
• Cache directory creation works correctly in concurrent scenarios
• Proper error handling when directory cannot be created
• Docker Compose configuration works as expected

📝 Breaking Changes

None - This PR is fully backward compatible.

🔗 Related Issues

Fixes:

• Warning: mkdir(): File exists error in CleanTranslationCacheListener::isCacheExpired() when multiple processes access the cache directory simultaneously

📚 Documentation

• Improved error handling in cache directory creation
• Docker Compose configuration updated to modern standards
• No user-facing changes required