fix Dockerfile prisma client generation

Backend/Dockerfile

@@ -31,13 +31,18 @@ RUN npm install -g pnpm
 COPY package*.json ./
 COPY pnpm-lock.yaml* ./
 
-# Install production dependencies only
-RUN pnpm install --prod --frozen-lockfile
+# Install production dependencies and prisma for generate
+RUN pnpm install --frozen-lockfile
+
+# Copy prisma schema and generate client
+COPY --from=builder /app/prisma ./prisma
+RUN pnpm prisma:generate
+
+# Remove devDependencies
+RUN pnpm prune --prod
 
 # Copy built files from builder
 COPY --from=builder /app/dist ./dist
-COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma
-COPY --from=builder /app/prisma ./prisma
 COPY --from=builder /app/public ./public
 
 # Set environment