feat(alerts): zehn Warnregeln mit Worker, Liste und Einstellungen (#011)

Regeln als reine Funktionen, Abgleich oeffnet und schliesst Warnungen anhand
eines Fingerabdrucks. Worker wertet stuendlich aus, zusaetzlich nach jedem
Report. 123 Tests.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "proxledger",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "private": true,
   "scripts": {
     "dev": "next dev",
@@ -18,7 +18,9 @@
     "db:studio": "prisma studio",
     "db:generate": "prisma generate",
     "postinstall": "prisma generate",
-    "issues:sync": "tsx scripts/gitea-issues.ts"
+    "issues:sync": "tsx scripts/gitea-issues.ts",
+    "worker": "tsx src/worker/index.ts",
+    "alerts:check": "tsx scripts/alerts-pruefen.ts"
   },
   "dependencies": {
     "@node-rs/argon2": "^2.2.1",
@@ -28,6 +30,7 @@
     "admin-lte": "^4.9.1",
     "bootstrap": "^5.3.8",
     "bootstrap-icons": "^1.13.1",
+    "croner": "^10.0.1",
     "next": "16.3.5",
     "react": "19.2.8",
     "react-dom": "19.2.8",