feat(docker): add production Dockerfile, docker-compose setup and healthcheck API

Dockerfile

@@ -1,25 +1,38 @@
-# Build-Phase
-FROM node:20-slim AS builder
+# STAGE 1: Dependencies & Build
+FROM node:20-alpine AS builder
 WORKDIR /app
+
 COPY package*.json ./
-RUN npm install --legacy-peer-deps
+RUN npm ci
+
 COPY . .
+ENV NODE_ENV=production
 RUN npm run build
 
-# Production-Phase (Node SSR Runner)
-FROM node:20-slim AS runner
+# STAGE 2: Production Runner
+FROM node:20-alpine AS runner
 WORKDIR /app
 
 ENV NODE_ENV=production
 ENV HOST=0.0.0.0
-ENV PORT=4321
+ENV PORT=3000
 ENV DATA_DIR=/app/data
 
-COPY --from=builder /app/package*.json ./
-COPY --from=builder /app/node_modules ./node_modules
-COPY --from=builder /app/dist ./dist
-COPY --from=builder /app/data_template ./data_template
+# Erstelle Kunden-Volume Ordner
+RUN mkdir -p /app/data && chown -R node:node /app
 
-EXPOSE 4321
+COPY package*.json ./
+RUN npm ci --only=production
+
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/public ./public
+
+USER node
+
+EXPOSE 3000
+
+# Healthcheck für Docker / Nginx Proxy
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1
 
 CMD ["node", "./dist/server/entry.mjs"]