refactor(docker): drop deps stage and remove .env from image

deps stage cache doesn't survive DinD CI restarts — merged into builder.
.env removed from image; runtime env injected via K8s deployment.

Dockerfile

@@ -1,27 +1,16 @@
-FROM node:24.0.1-alpine AS deps
-
-WORKDIR /app
-
-RUN apk add --no-cache libc6-compat
-
-COPY package.json package-lock.json ./
-RUN npm install --legacy-peer-deps
-
-
 FROM node:24.0.1-alpine AS builder
 
 WORKDIR /app
 
 ENV NEXT_TELEMETRY_DISABLED=1
 
-COPY --from=deps /app/node_modules ./node_modules
+RUN apk add --no-cache libc6-compat
+
+COPY package.json package-lock.json ./
+RUN npm install --legacy-peer-deps
 
-# Copy source + .env vào build context
 COPY . .
 
-# Đảm bảo .env có trong builder stage
-COPY .env .env
-
 RUN npm run build
 
 
@@ -39,9 +28,6 @@ COPY --from=builder /app/public ./public
 COPY --from=builder --chown=1001:1001 /app/.next/standalone ./
 COPY --from=builder --chown=1001:1001 /app/.next/static ./.next/static
 
-# Copy .env vào runtime để next.config rewrites đọc được khi server start
-COPY --from=builder /app/.env ./.env
-
 USER 1001
 
 ENV PORT=3000