Update frontend dashboard and health service

tmp/Dockerfile

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+#
+# FRONTEND DOCKERFILE
+#
+# Multi-stage image for the Next.js SPA/SSR frontend.
+# - runner: production server with minimal footprint
+# - builder: compiles the Next.js app
+# - dev: hot-reload friendly image
+#
+# COMPOSE_PROFILES decides which stage is used by docker-compose.yml.
+#
+
+FROM node:22-slim AS base
+WORKDIR /app
+
+ENV NPM_CONFIG_LOGLEVEL=warn \
+    NODE_OPTIONS="--enable-source-maps"
+
+# ------------------------------------------------------------------------------
+# Dependencies cache
+# ------------------------------------------------------------------------------
+FROM base AS deps
+COPY package*.json ./
+RUN if [ -f package-lock.json ]; then npm ci; else npm install; fi
+
+# ------------------------------------------------------------------------------
+# Production dependencies only (pruned to omit dev tooling)
+# ------------------------------------------------------------------------------
+FROM base AS prod-deps
+COPY package*.json ./
+RUN if [ -f package-lock.json ]; then npm ci --omit=dev; else npm install --omit=dev; fi
+
+# ------------------------------------------------------------------------------
+# Builder: compile the application for production
+# ------------------------------------------------------------------------------
+FROM base AS builder
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NODE_ENV=production
+RUN npm run build
+
+# ------------------------------------------------------------------------------
+# Production runner: serve the built Next.js app
+# ------------------------------------------------------------------------------
+FROM node:22-slim AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production \
+    NEXT_TELEMETRY_DISABLED=1
+
+USER node
+COPY --from=prod-deps --chown=node:node /app/node_modules ./node_modules
+COPY --from=builder --chown=node:node /app/.next ./.next
+COPY --from=builder --chown=node:node /app/public ./public
+COPY --from=builder --chown=node:node /app/package.json ./package.json
+
+EXPOSE 3000
+CMD ["npm", "run", "start"]
+
+# ------------------------------------------------------------------------------
+# Development: keeps node_modules and sources mounted for hot reload
+# ------------------------------------------------------------------------------
+FROM deps AS dev
+WORKDIR /app
+
+ENV NODE_ENV=development \
+    NEXT_TELEMETRY_DISABLED=1
+
+USER node
+EXPOSE 3000
+CMD ["npm", "run", "dev", "--", "--hostname", "0.0.0.0", "--port", "3000"]