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/home-security-agent/agent/pg_store.py

@@ -25,7 +25,7 @@ def _connect():
     if url:
         return psycopg2.connect(url)
     return psycopg2.connect(
-        host=os.getenv("PG_HOST", "192.168.1.211"),
+        host=os.getenv("PG_HOST", "192.168.1.105"),
         port=int(os.getenv("PG_PORT", "5433")),
         user=os.getenv("PG_USER", "mo"),
         password=os.getenv("PG_PASSWORD", ""),