chore(docker): setup google mirror for base images

backend/Dockerfile

@@ -5,7 +5,7 @@
 # -----------------------------------------------------------------------------
 # Stage 1: Build
 # -----------------------------------------------------------------------------
-FROM golang:1.24-alpine AS builder
+FROM mirror.gcr.io/library/golang:1.24-alpine AS builder
 
 WORKDIR /build
 
@@ -31,7 +31,7 @@ RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
 # -----------------------------------------------------------------------------
 # Stage 2: Production (Minimal Image)
 # -----------------------------------------------------------------------------
-FROM alpine:3.19
+FROM mirror.gcr.io/library/alpine:3.19
 
 # Security: Run as non-root user
 RUN addgroup -g 1001 -S appgroup && \

backoffice/Dockerfile

@@ -4,7 +4,7 @@
 # =============================================================================
 
 # Stage 1: Base with pnpm
-FROM node:20-alpine AS base
+FROM mirror.gcr.io/library/node:20-alpine AS base
 RUN corepack enable && corepack prepare pnpm@9.15.4 --activate
 RUN apk add --no-cache libc6-compat
 
@@ -31,7 +31,7 @@ RUN pnpm prune --prod
 # =============================================================================
 # Stage 4: Production - Minimal runtime
 # =============================================================================
-FROM node:20-alpine AS production
+FROM mirror.gcr.io/library/node:20-alpine AS production
 
 # Security: non-root user
 RUN addgroup -g 1001 -S nodejs && \

frontend/Dockerfile

@@ -5,7 +5,7 @@
 # -----------------------------------------------------------------------------
 # Stage 1: Dependencies
 # -----------------------------------------------------------------------------
-FROM node:20-alpine AS deps
+FROM mirror.gcr.io/library/node:20-alpine AS deps
 
 WORKDIR /app
 
@@ -17,7 +17,7 @@ RUN npm ci --only=production --ignore-scripts && \
 # -----------------------------------------------------------------------------
 # Stage 2: Builder
 # -----------------------------------------------------------------------------
-FROM node:20-alpine AS builder
+FROM mirror.gcr.io/library/node:20-alpine AS builder
 
 WORKDIR /app
 
@@ -36,7 +36,7 @@ RUN npm run build
 # -----------------------------------------------------------------------------
 # Stage 3: Production Runner
 # -----------------------------------------------------------------------------
-FROM node:20-alpine AS runner
+FROM mirror.gcr.io/library/node:20-alpine AS runner
 
 WORKDIR /app
 

job-scraper-multisite/Dockerfile

@@ -2,7 +2,7 @@
 # GoHorse Jobs Scraper - Python Dockerfile
 # =============================================================================
 
-FROM python:3.12-slim
+FROM mirror.gcr.io/library/python:3.12-slim
 
 WORKDIR /app
 

seeder-api/Dockerfile

@@ -2,7 +2,7 @@
 # GoHorse Jobs Seeder API - Production Dockerfile
 # =============================================================================
 
-FROM node:20-alpine
+FROM mirror.gcr.io/library/node:20-alpine
 
 WORKDIR /app