feat: extend notification system with batch sender, bulk dialog, and logging

Add NotificationLog schema extensions (nullable userId, email, roundId,
projectId, batchId fields), batch notification sender service, and bulk
notification dialog UI. Include utility scripts for debugging and seeding.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/send-invite.ts

@@ -0,0 +1,26 @@
+import { sendInvitationEmail } from '../src/lib/email';
+
+const token = '6f974b1da9fae95f74bbcd2419df589730979ac945aeaa5413021c00311b5165';
+const url = 'http://localhost:3000/accept-invite?token=' + token;
+
+async function main() {
+  console.log('Sending styled invitation email...');
+  console.log('To: matt.ciaccio@gmail.com');
+  console.log('URL:', url);
+
+  try {
+    await sendInvitationEmail(
+      'matt.ciaccio@gmail.com',
+      'Matt Ciaccio',
+      url,
+      'APPLICANT',
+      72
+    );
+    console.log('SUCCESS: Styled invitation email sent!');
+  } catch (err: any) {
+    console.error('FAILED:', err.message || err);
+  }
+  process.exit(0);
+}
+
+main();