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/src/api/submissions.ts

@@ -1,6 +1,7 @@
 import { Router, Request, Response } from 'express';
 import { prisma } from '../db/prisma';
 import { requireAuth, requires } from '../middleware/auth';
+import { importPostFromNostr, resolveSubmissionImport } from '../services/postImport';
 
 const router = Router();
 
@@ -94,6 +95,22 @@ router.patch(
         return;
       }
 
+      // Approval publishes the referenced Nostr article to the blog. Do this
+      // before flipping the status so a failed import doesn't leave a submission
+      // marked APPROVED without a corresponding live post.
+      let post = null;
+      if (status === 'APPROVED') {
+        const importInput = await resolveSubmissionImport(submission);
+        if (!importInput) {
+          res.status(422).json({
+            error:
+              'Could not resolve the submitted Nostr event from relays. The post was not published, so the submission was left unchanged.',
+          });
+          return;
+        }
+        post = await importPostFromNostr(importInput);
+      }
+
       const updated = await prisma.submission.update({
         where: { id: req.params.id as string },
         data: {
@@ -103,7 +120,7 @@ router.patch(
         },
       });
 
-      res.json(updated);
+      res.json({ submission: updated, post });
     } catch (err) {
       console.error('Review submission error:', err);
       res.status(500).json({ error: 'Internal server error' });