new file: .dockerignore

new file:   .env.example
	new file:   Dockerfile
	modified:   backend/.env.example
	modified:   backend/package.json
	renamed:    backend/src/migrations/run.ts -> backend/src/scripts/run.ts
	renamed:    backend/src/migrations/seed.ts -> backend/src/scripts/seed.ts
	new file:   docker-compose.external-db.yml
	new file:   docker-compose.yml

backend/.env.example

@@ -15,31 +15,4 @@ JWT_EXPIRES_IN=24h
 
 # API Rate Limiting
 RATE_LIMIT_WINDOW_MS=900000
-RATE_LIMIT_MAX_REQUESTS=100
-
-# Target Databases Configuration (JSON format)
-# This is where your API endpoints will execute queries
-TARGET_DATABASES='[
-  {
-    "id": "main_postgres",
-    "name": "Main PostgreSQL",
-    "type": "postgresql",
-    "host": "localhost",
-    "port": 5432,
-    "database": "your_database",
-    "user": "your_user",
-    "password": "your_password",
-    "ssl": false
-  },
-  {
-    "id": "analytics_db",
-    "name": "Analytics Database",
-    "type": "postgresql",
-    "host": "localhost",
-    "port": 5432,
-    "database": "analytics",
-    "user": "analytics_user",
-    "password": "analytics_password",
-    "ssl": false
-  }
-]'
+RATE_LIMIT_MAX_REQUESTS=100