fix: auto-publish approved blog submissions on approval

Approved user submissions now import into the blog automatically, with a
backfill script for existing approvals and a WebSocket polyfill so backend
Nostr relay queries work on Node 20.

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

backend/package.json

@@ -10,7 +10,8 @@
     "db:baseline-and-migrate": "bash scripts/baseline-and-migrate.sh",
     "db:seed": "dotenv -e ../.env -e .env -- prisma db seed",
     "db:studio": "dotenv -e ../.env -e .env -- prisma studio",
-    "migrate:deploy": "dotenv -e ../.env -e .env -- prisma migrate deploy"
+    "migrate:deploy": "dotenv -e ../.env -e .env -- prisma migrate deploy",
+    "backfill-submissions": "dotenv -e ../.env -e .env -- tsx scripts/backfill-approved-submissions.ts"
   },
   "prisma": {
     "seed": "tsx prisma/seed.ts"
@@ -28,7 +29,8 @@
     "nostr-tools": "^2.10.0",
     "slugify": "^1.6.8",
     "ulid": "^3.0.2",
-    "uuid": "^11.0.0"
+    "uuid": "^11.0.0",
+    "ws": "^8.21.0"
   },
   "devDependencies": {
     "@types/cors": "^2.8.17",
@@ -38,6 +40,7 @@
     "@types/morgan": "^1.9.10",
     "@types/multer": "^2.1.0",
     "@types/uuid": "^10.0.0",
+    "@types/ws": "^8.18.1",
     "prisma": "^6.0.0",
     "tsx": "^4.19.0",
     "typescript": "^5.6.0"