Update Dockerfile.backend via Son of Anton

Dockerfile.backend

-FROM node:20-alpine AS base
-RUN apk add --no-cache libc6-compat openssl
+FROM node:20-alpine AS builder
 
-WORKDIR /app
+RUN apk add --no-cache libc6-compat openssl python3 make g++
+
+WORKDIR /build
 
-# Copy everything
-COPY package*.json ./
-COPY backend/package*.json ./backend/
-COPY shared/package*.json ./shared/
-COPY prisma/ ./prisma/
+# Copy prisma schema (single file, consolidated)
+COPY prisma/schema.prisma ./prisma/schema.prisma
+
+# Copy shared package
+COPY shared/ ./shared/
 
 # Install backend deps
-WORKDIR /app/backend
+COPY backend/package.json backend/package-lock.json* ./backend/
+WORKDIR /build/backend
 RUN npm install --legacy-peer-deps
 
-# Copy source
-WORKDIR /app
-COPY shared/ ./shared/
+# Copy backend source
+WORKDIR /build
 COPY backend/ ./backend/
-COPY prisma/ ./backend/prisma/
 
-# Generate Prisma
-WORKDIR /app/backend
+# Put prisma inside backend
+RUN cp -r /build/prisma /build/backend/prisma
+
+WORKDIR /build/backend
+
+# Generate Prisma client
 RUN npx prisma generate --schema=./prisma/schema.prisma
 
 # Build
 RUN npm run build
 
-# Production stage
-FROM node:20-alpine AS runner
+# ---- Production ----
+FROM node:20-alpine
 RUN apk add --no-cache libc6-compat openssl
 WORKDIR /app
+ENV NODE_ENV=production
 
-COPY --from=base /app/backend/dist ./dist
-COPY --from=base /app/backend/node_modules ./node_modules
-COPY --from=base /app/backend/prisma ./prisma
-COPY --from=base /app/backend/package.json ./
+COPY --from=builder /build/backend/dist ./dist
+COPY --from=builder /build/backend/node_modules ./node_modules
+COPY --from=builder /build/backend/prisma ./prisma
+COPY --from=builder /build/backend/package.json ./
 
-ENV NODE_ENV=production
 EXPOSE 3001
 
-CMD ["sh", "-c", "npx prisma migrate deploy --schema=./prisma/schema.prisma && node dist/main.js"]
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+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://localhost:3001/api/health || exit 1
+
+CMD ["sh", "-c", "npx prisma migrate deploy --schema=./prisma/schema.prisma 2>/dev/null || true; node dist/main.js"]
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