feat: rules engine — json-rules-engine integration with worklist scoring

- Self-contained NestJS module: types, storage (Redis+JSON), fact providers, action handlers
- PriorityConfig CRUD (slider values for task weights, campaign weights, source weights)
- Score action handler with SLA multiplier + campaign multiplier formula
- Worklist consumer: scores and ranks items before returning
- Hospital starter template (7 rules)
- REST API: /api/rules/* (CRUD, priority-config, evaluate, templates)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -35,6 +35,7 @@
     "ai": "^6.0.116",
     "axios": "^1.13.6",
     "ioredis": "^5.10.1",
+    "json-rules-engine": "^6.6.0",
     "kafkajs": "^2.2.4",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1",