feat(cost): add zombie hunter, Slack interactions, composite scoring

- Zombie resource hunter: detects idle EC2/RDS/EBS/EIP/NAT resources
- Slack interactive handler: acknowledge, snooze, create-ticket actions
- Composite anomaly scorer: Z-Score + rate-of-change + pattern + novelty
- Cold-start fast path for new resources (<7 days data)
- 005_zombies.sql migration

products/03-alert-intelligence/package.json

@@ -25,13 +25,13 @@
     "zod": "^3.23.0"
   },
   "devDependencies": {
-    "@types/jsonwebtoken": "^9.0.6",
-    "@types/node": "^20.14.0",
-    "@types/pg": "^8.11.0",
+    "@types/jsonwebtoken": "^9.0.10",
+    "@types/node": "^20.19.35",
+    "@types/pg": "^8.18.0",
     "@types/uuid": "^9.0.8",
     "eslint": "^9.5.0",
     "tsx": "^4.15.0",
-    "typescript": "^5.5.0",
+    "typescript": "^5.9.3",
     "vitest": "^1.6.0"
   }
 }