feat: initial commit at project root

Dockerfile

@@ -0,0 +1,30 @@
+# Stage 1: Build & install production dependencies
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy dependency configs
+COPY package.json ./
+
+# Install only production dependencies
+RUN npm install --only=production
+
+# Stage 2: Final runtime container
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Copy built node_modules
+COPY --from=builder /app/node_modules ./node_modules
+COPY package.json ./
+COPY cmd/ ./cmd/
+COPY internal/ ./internal/
+
+# Use the built-in non-root user 'node' (UID 1000)
+USER node
+
+# Expose backend service port
+EXPOSE 47880
+
+# Execute server
+CMD ["node", "cmd/server/main.js"]