Initial setup: snakkimo API server with PostgreSQL connection

Node.js/Express API server that connects to PostgreSQL via environment variables.
Includes health check, table listing, row queries, and raw SQL endpoint.
Designed for deployment in Coolify alongside the snakkimo PostgreSQL container.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

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+# PostgreSQL connection (set these in Coolify as environment variables)
+DB_HOST=your-postgres-service-name   # In Coolify: der interne Service-Name des PostgreSQL-Containers
+DB_PORT=5432
+DB_NAME=snakkimo
+DB_USER=postgres
+DB_PASSWORD=your-password
+DB_SSL=false
+
+# API
+PORT=3000