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

.env.example

@@ -0,0 +1,29 @@
+# ============================================
+# KIS API Builder - Configuration
+# ============================================
+# Copy this file to .env and adjust values
+#
+# For default setup (built-in DB):
+#   Only APP_PORT, DB_PASSWORD and JWT_SECRET are needed
+#
+# For external database:
+#   Set all DB_* variables
+# ============================================
+
+# External port (access from host machine)
+APP_PORT=3000
+
+# Database password (used by both built-in and external DB)
+DB_PASSWORD=your_secure_password_here
+
+# JWT Configuration
+JWT_SECRET=your-super-secret-jwt-key-change-this-in-production
+JWT_EXPIRES_IN=24h
+
+# ============================================
+# External Database (only for docker-compose.external-db.yml)
+# ============================================
+# DB_HOST=your-postgres-host
+# DB_PORT=5432
+# DB_NAME=api_builder
+# DB_USER=postgres