feat(devops): improve multi-stage production Dockerfile for NestJS API

- Use pnpm deploy --prod for pruned production node_modules (smaller image)
- Add docker-entrypoint.sh with optional Prisma migration support (RUN_MIGRATIONS)
- Copy generated Prisma client explicitly into production stage
- Add OCI image labels for container registry metadata
- Update .dockerignore: exclude apps/web, libs/ai-services, agent configs, Python artifacts
- Add build directive + RUN_MIGRATIONS env to docker-compose.prod.yml
- Maintain non-root user, dumb-init signal handling, and healthcheck

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/docker-entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+# =============================================================================
+# GoodGo API — Docker Entrypoint
+#
+# Optionally runs Prisma migrations before starting the application.
+# Set RUN_MIGRATIONS=true to apply pending migrations on startup.
+# In Kubernetes, prefer running migrations as an init container instead.
+# =============================================================================
+
+if [ "${RUN_MIGRATIONS}" = "true" ]; then
+  echo "[entrypoint] Running Prisma migrations..."
+  npx prisma migrate deploy --schema ./prisma/schema.prisma
+  echo "[entrypoint] Migrations complete."
+fi
+
+exec "$@"