fix: update PrismaService constructor to use correct datasource format and include prisma.config.ts in Dockerfile

backend/Dockerfile

@@ -26,6 +26,7 @@ ENV NODE_ENV=production
 COPY --from=builder /app/package.json ./package.json
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/prisma.config.ts ./prisma.config.ts
 COPY --from=builder /app/dist ./dist
 
 EXPOSE 8080