Initial commit — MediaStack VM config and documentation

VM 113 on PVE1: Sonarr/Radarr/Prowlarr/qBittorrent behind WireGuard VPN.
All traffic exits through DO server, bypassing home ISP.
NFS exports movies and TV to Jellyfin (VM 112).

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

config/jarvis-agent/config.json.example

@@ -0,0 +1,12 @@
+{
+  "server_url": "https://165.22.1.228",
+  "host_header": "jarvis.orbishosting.com",
+  "agent_id": "mediastack_5038de87",
+  "api_key": "REDACTED",
+  "agent_type": "linux",
+  "heartbeat_interval": 10,
+  "metrics_interval": 30,
+  "jarvis_url": "https://165.22.1.228",
+  "registration_key": "REDACTED",
+  "ssl_verify": false
+}