feat: house tracker with home worker, alerts and listing map

Collects Pararius rent/buy listings into Postgres via a worker that runs on a
residential connection, sends Discord/ntfy alerts for new listings matching
rules, and shows an admin-only map, market stats and worker log.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013HfF5tnChi8tkCx9svJP6D

scripts/migrate-house-tracker.ts

@@ -0,0 +1,15 @@
+import { readFile } from 'node:fs/promises';
+import postgres from 'postgres';
+
+if (!process.env.DB_URL) throw new Error('DB_URL is required');
+const client = postgres(process.env.DB_URL, { max: 1 });
+try {
+	await client.begin(async (tx) => {
+		await tx.unsafe(
+			await readFile(new URL('./house-tracker-migration.sql', import.meta.url), 'utf8')
+		);
+	});
+	console.log('House tracker migration applied');
+} finally {
+	await client.end();
+}