Add MinIO S3 storage integration

- Add minio disk configuration in filesystems.php
- Create helper functions for MinIO URLs (minio_url, minio_image_url)
- Update composer.json with AWS SDK (for future S3 support)
- Add MinIO env vars to docker-compose.local.yml
- Add .env examples for MinIO configuration

composer.json

@@ -11,7 +11,8 @@
         "guzzlehttp/guzzle": "~5.0",
         "google/recaptcha": "~1.1",
         "spatie/laravel-analytics": "^1.4",
-        "league/flysystem-sftp": "^1.0"
+        "league/flysystem-sftp": "^1.0",
+        "aws/aws-sdk-php": "~3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",
@@ -24,7 +25,10 @@
         ],
         "psr-4": {
             "App\\": "app/"
-        }
+        },
+        "files": [
+            "app/helpers.php"
+        ]
     },
     "autoload-dev": {
         "classmap": [