feat: Implement comprehensive architectural guidelines and clean code standards

- Establish feature-based architecture with clear separation between Logic, Data, and Shared layers
- Define directory structure conventions for controllers, entities, DTOs, managers, mappers, models, processors, providers, repositories, and services
- Implement Symfony 7.4+ compliance with proper Request handling (UI layer only)
- Enforce PHP 8+ attributes usage instead of annotations
- Set up proper DTO usage in UseCases with immutable properties
- Configure repository pattern with interfaces in Logic layer and implementations in Data layer
- Implement strict separation of concerns with UI layer handling Request objects exclusively
- Define clear naming conventions (PascalCase for feature names)
- Add shared components directory for reusable elements across features
- Establish HTTP status code constants usage instead of magic numbers
- Configure proper file placement for controllers in UI/Frontend, UI/Api, and UI/CLI subdirectories
- Enforce modern PHP practices with explicit return types and strict typing

This commit lays the foundation for a maintainable, scalable Symfony 7.4+ application following clean architecture principles and modern coding standards.

.gitignore

@@ -0,0 +1,133 @@
+# Symfony 7.4+ .gitignore
+
+# Cache and logs
+/var/cache/
+/var/log/
+/var/sessions/
+
+# Runtime data
+/var/data/
+/var/tmp/
+
+# Dependencies
+/vendor/
+composer.lock
+
+# IDE
+.idea/
+.vscode/
+.phpstorm.meta.php
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+# Local configuration
+/config/packages/local/
+/config/routes/local/
+/config/services_local.yaml
+
+# Environment variables
+.env.local
+.env.*
+!.env.example
+
+# Symfony Profiler
+/var/cache/profiler/
+
+# Web assets
+/public/build/
+/public/assets/
+
+# PHPStan and other tools
+/phpstan.neon
+/phpunit.xml
+/phpunit.xml.dist
+/psalm.xml
+/psalm.xml.dist
+/symfony.lock
+
+# Symfony binary
+/bin/symfony
+
+# Local test databases
+/test_db.sql
+
+# Backup files
+*.backup
+*.bak
+
+# Node.js
+/node_modules/
+npm-debug.log
+yarn-debug.log
+yarn-error.log
+
+# IDE specific
+*.swp
+*.swo
+*.swn
+*~
+
+# Composer
+composer.phar
+composer.phar.md5sum
+
+# SensioDistribution
+/SensioDistribution/Installer/
+
+# Symfony
+/web/app_dev.php
+/web/config.php
+
+# Symfony cache
+/var/cache/*
+!/var/cache/.gitkeep
+
+# Symfony logs
+/var/log/*
+!/var/log/.gitkeep
+
+# Symfony sessions
+/var/sessions/*
+!/var/sessions/.gitkeep
+
+# Symfony data
+/var/data/*
+!/var/data/.gitkeep
+
+# Symfony tmp
+/var/tmp/*
+!/var/tmp/.gitkeep
+
+# Symfony profiler
+/var/cache/profiler/*
+!/var/cache/profiler/.gitkeep
+
+# Symfony assets
+/public/assets/*
+!/public/assets/.gitkeep
+
+# Symfony build
+/public/build/*
+!/public/build/.gitkeep
+
+# Docker
+.docker/
+.Dockerfile
+.dockerignore
+
+# Local development
+.local/
+
+# Temporary files
+*.tmp
+*.temp
+
+# PHPUnit
+/phpunit.xml
+/phpunit.xml.dist
+/phpunit_coverage.xml
+
+# Symfony binary
+/bin/symfony