improvement: fixed some package.json issues. readme files updated.

backend/Dockerfile

@@ -1,18 +1,19 @@
 # ============================================
 # STAGE 1: BUILDER STAGE
 # ============================================
-FROM node:18-alpine AS builder
+FROM node:20-alpine AS builder
 
 WORKDIR /app
 
 COPY package*.json ./
+COPY .npmrc ./
 COPY prisma ./prisma/
 
 RUN npm ci
 
 COPY . .
 
-RUN npx prisma generate
+RUN npm run prisma:generate
 RUN npm run build
 RUN npm prune --production
 
@@ -20,7 +21,7 @@ RUN npm prune --production
 # ============================================
 # STAGE 2: PRODUCTION STAGE
 # ============================================
-FROM node:18-alpine
+FROM node:20-alpine
 
 RUN apk add --no-cache dumb-init
 
@@ -29,14 +30,10 @@ WORKDIR /app
 RUN addgroup -g 1001 -S nodejs && \
     adduser -S dyolink -u 1001
 
+# Prisma client comes from the builder (npm prune --production keeps @prisma/client).
 COPY package*.json ./
 COPY prisma ./prisma/
 
-RUN npm ci --only=production && \
-    npm cache clean --force
-
-RUN npx prisma generate
-
 COPY --from=builder /app/dist ./dist
 COPY --from=builder /app/node_modules ./node_modules