migrate: update all references from DO server to PVE1 JARVIS VM

- config.php: JARVIS_IP → 10.48.200.211, HA_URL → direct LAN 10.48.200.97
- facts_collector/stats_cache: Proxmox API → direct 10.48.200.90 (not DDNS)
- chat.php: system context updated to reflect PVE1/nginx instead of DO/OLS
- do_server.php: display IP → 10.48.200.211 (reads /proc for JARVIS VM stats)
- jarvis-app.js: service labels nginx/mariadb instead of lshttpd
- jarvis-overlays.js: network map JARVIS node IP → 10.48.200.211
- index.html: DO SERVER labels → JARVIS VM, cache bust v=20260618a
- jarvis-agents.js: agent install URL uses window.location.origin

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/endpoints/do_server.php

@@ -60,7 +60,7 @@ $uptimeDays = intdiv($uptime, 86400);
 $uptimeHrs  = intdiv($uptime % 86400, 3600);
 
 echo json_encode([
-    "ip"           => DO_SERVER_IP,
+    "ip"           => "10.48.200.211",  // JARVIS VM (PVE1)
     "reachable"    => true,
     "cpu_pct"      => getCpuPct(),
     "memory"       => [