Document VM 102 security stack and update IPs to 192.168.1.105.

Add ARCHITECTURE.md and HOMELAB_IPS.md, refresh inventory and app configs
for Postgres, Neo4j, Homelab Command, pgAdmin, Homarr, and Homepage links.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/monitoring/prometheus.yml

@@ -12,14 +12,14 @@ scrape_configs:
     static_configs:
       - targets: ["postgres-exporter-homelab:9187"]
         labels:
-          instance: postgres-homelab
+          instance: postgres-vm102
 
   # Neo4j 4.4+ enterprise metrics.prometheus.enabled → endpoint op poort 2004
   - job_name: neo4j
     scrape_interval: 30s
     metrics_path: /metrics
     static_configs:
-      - targets: ["neo4j:2004"]
+      - targets: ["192.168.1.105:2004"]
         labels:
           instance: neo4j