fix: I dunno, I'm making git server changes

frontend/Dockerfile

@@ -1,7 +1,11 @@
 # Production Dockerfile for MotoVaultPro Frontend
+# Uses mirrored base images from GitLab Container Registry
 
-# Stage 1: Base with dependencies  
-FROM node:lts-alpine AS base
+# Build argument for registry (defaults to GitLab mirrors, falls back to Docker Hub)
+ARG REGISTRY_MIRRORS=registry.motovaultpro.com/mirrors
+
+# Stage 1: Base with dependencies
+FROM ${REGISTRY_MIRRORS}/node:20-alpine AS base
 RUN apk add --no-cache dumb-init curl
 WORKDIR /app
 COPY package*.json ./
@@ -29,7 +33,7 @@ COPY . .
 RUN npm run build
 
 # Stage 4: Production stage with nginx
-FROM nginx:alpine AS production
+FROM ${REGISTRY_MIRRORS}/nginx:alpine AS production
 
 # Add curl for healthchecks
 RUN apk add --no-cache curl