fix: implement Lean Docker strategy with mintel/runtime and remove explicit container_name fields

packages/infra/docker/Dockerfile.runtime

@@ -0,0 +1,19 @@
+FROM node:20-alpine
+
+# Install essential production utilities
+RUN apk add --no-cache curl libc6-compat
+
+# Set standard production environment
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+WORKDIR /app
+
+# Create non-root user for security
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 nextjs
+
+# Expose the default Next.js port
+EXPOSE 3000