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>

Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY src/ ./src/
+
+EXPOSE 3000
+
+CMD ["node", "src/index.js"]