Refactor entities and codebase for native property usage

- Replaced getters/setters with direct property access across entities and repositories.
- Added and configured `martin-georgiev/postgresql-for-doctrine` for PostgreSQL enhancements.
- Updated Doctrine configuration with types, mappings, and JSONB query functions.
- Removed unused `EliminationService` and related YAML configurations.

composer.json

@@ -13,6 +13,7 @@
         "doctrine/doctrine-bundle": "^2.16.2",
         "doctrine/doctrine-migrations-bundle": "^3.4.2",
         "doctrine/orm": "^3.5.2",
+        "martin-georgiev/postgresql-for-doctrine": "^3.5",
         "phpdocumentor/reflection-docblock": "^5.6.3",
         "phpoffice/phpspreadsheet": "^5.1",
         "phpstan/phpdoc-parser": "^2.3",