Add local Docker image build and export for server deploy

Build and gzip the API image on a machine with good network, then docker load on the server without remote npm builds.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -27,7 +27,8 @@
     "db:reset": "prisma migrate reset --force",
     "docker:up": "docker compose up -d --build",
     "docker:down": "docker compose down",
-    "docker:logs": "docker compose logs -f api"
+    "docker:logs": "docker compose logs -f api",
+    "docker:export": "bash scripts/build-and-export-image.sh"
   },
   "prisma": {
     "seed": "ts-node --compiler-options {\"module\":\"CommonJS\"} prisma/seed.ts"