feat: Multi-database and AWS S3 storage support

.env.example

@@ -33,4 +33,55 @@ PUBLIC_ASSETS_URL=http://localhost:3000/assets
 # LiveKit (voice chat)
 LIVEKIT_WS_URL=
 LIVEKIT_API_KEY=
-LIVEKIT_API_SECRET=
+LIVEKIT_API_SECRET=
+
+# ==============================================
+# DATABASE CONFIGURATION
+# ==============================================
+# Configure your database connection here.
+# 
+# Supported databases:
+# - PostgreSQL (DB_TYPE=pg)
+# - MySQL (DB_TYPE=mysql2) 
+# - SQLite (fallback - no configuration needed)
+#
+# If database environment variables are not provided,
+# the application will automatically fall back to SQLite.
+
+# Database type - specify the database engine to use
+# Options: 'pg' (PostgreSQL), 'mysql2' (MySQL)
+DB_TYPE=pg
+
+# Database connection details
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=your_username
+DB_PASSWORD=your_password
+DB_NAME=your_database_name
+DB_SCHEMA=your_database_schema
+
+# ==============================================
+# STORAGE CONFIGURATION
+# ==============================================
+# Configure your file storage system here.
+# 
+# Supported storage types:
+# - Local file system (default - no configuration needed)
+# - AWS S3 (requires S3 configuration below)
+#
+# If STORAGE_TYPE is provided, AWS S3 storage will be used.
+# If STORAGE_TYPE is empty or not set, local file storage will be used.
+# 
+# AWS credentials can be provided via environment variables below,
+# or through AWS CLI configuration, IAM roles, or instance profiles.
+
+# AWS S3 storage configuration (only required when using S3)
+# To use AWS S3 storage, set STORAGE_TYPE and other S3 variables below
+STORAGE_TYPE=
+S3_BUCKET_NAME=bucket-name
+AWS_ACCESS_KEY_ID=access-key-id
+AWS_SECRET_ACCESS_KEY=secret-key-id
+S3_REGION=eu-west-1
+S3_ASSETS_PREFIX=
+S3_COLLECTIONS_PREFIX=
+S3_STORAGE_PREFIX=