feat: 2.0.0-alpha.11 — DB-backed service registry + LAN auto-discovery

- monitored_services table (mig 015) replaces config/services.json (now a boot seed)
- owner CRUD over /api/health/services; GET is DB-backed; cron+worker read the DB
- discover.lan worker: pure-Node TCP sweep + HTTP-title probe -> disabled 'discovered'
  candidates (never clobbers curated entries); POST /api/health/discover + GET .../discovered
- dashboard: Scan button + Discovered(N) section with one-click promote

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/jobs/index.js

@@ -6,8 +6,9 @@ import * as embed from './workers/embed.js';
 import * as karakeep from './workers/karakeep.js';
 import * as speedtest from './workers/speedtest.js';
 import * as healthCheck from './workers/health_check.js';
+import * as discover from './workers/discover.js';
 
-const WORKERS = [echo, url, blob, embed, karakeep, speedtest, healthCheck];
+const WORKERS = [echo, url, blob, embed, karakeep, speedtest, healthCheck, discover];
 
 export async function registerWorkers() {
   for (const w of WORKERS) {