chore: update monitoring URLs to production endpoints

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.mcp.json

@@ -35,8 +35,8 @@
         "serve"
       ],
       "env": {
-        "PROMETHEUS_URL": "http://localhost:9090",
-        "ALERTMANAGER_URL": "http://localhost:9093"
+        "PROMETHEUS_URL": "https://prometheus.home.2rjus.net",
+        "ALERTMANAGER_URL": "https://alertmanager.home.2rjus.net"
       }
     }
   }

TODO.md

@@ -17,6 +17,11 @@
 - [x] `nixpkgs-packages` - Index and search nixpkgs packages (implemented in `nixpkgs-search packages`)
 - [x] `lab-monitoring` - Query Prometheus and Alertmanager APIs (8 tools, no database required)
 
+## Lab Monitoring
+
+- [ ] Add `list_rules` tool - list Prometheus alerting and recording rules (via `/api/v1/rules`)
+- [ ] Add `get_rule_group` tool - get details for a specific rule group
+
 ## Nice to Have
 
 - [ ] Option history/diff - compare options between two revisions ("what changed in services.nginx between 24.05 and 24.11?")