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>

src/rules-engine/facts/lead-facts.provider.ts

@@ -0,0 +1,30 @@
+// src/rules-engine/facts/lead-facts.provider.ts
+
+import type { FactProvider, FactValue } from '../types/fact.types';
+
+export class LeadFactsProvider implements FactProvider {
+    name = 'lead';
+
+    async resolveFacts(lead: any): Promise<Record<string, FactValue>> {
+        const createdAt = lead.createdAt ? new Date(lead.createdAt).getTime() : Date.now();
+        const lastContacted = lead.lastContacted ? new Date(lead.lastContacted).getTime() : null;
+
+        return {
+            'lead.source': lead.leadSource ?? lead.source ?? null,
+            'lead.status': lead.leadStatus ?? lead.status ?? null,
+            'lead.priority': lead.priority ?? 'NORMAL',
+            'lead.campaignId': lead.campaignId ?? null,
+            'lead.campaignName': lead.campaignName ?? null,
+            'lead.interestedService': lead.interestedService ?? null,
+            'lead.contactAttempts': lead.contactAttempts ?? 0,
+            'lead.ageMinutes': Math.round((Date.now() - createdAt) / 60000),
+            'lead.ageDays': Math.round((Date.now() - createdAt) / 86400000),
+            'lead.lastContactedMinutes': lastContacted ? Math.round((Date.now() - lastContacted) / 60000) : null,
+            'lead.hasPatient': !!lead.patientId,
+            'lead.isDuplicate': lead.isDuplicate ?? false,
+            'lead.isSpam': lead.isSpam ?? false,
+            'lead.spamScore': lead.spamScore ?? 0,
+            'lead.leadScore': lead.leadScore ?? 0,
+        };
+    }
+}