Add dashboard summary view, server detail routing, and VM listing

Rearchitect to pure aggregator dashboard (no /proc) with bare agents
on each host. Agents report VM data via sudo virsh (cached 10s).
UI rewritten with hash-based routing: summary card grid and per-server
detail view with CPU grid, memory, load, uptime, and VM table.

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

run.sh

@@ -15,8 +15,8 @@ podman run -d \
   --name sysmon \
   -p 8083:8083 \
   --security-opt label=disable \
-  -v /proc:/host/proc:ro \
-  -e SYSMON_SERVERS="compute1:local,console:http://192.168.88.5:8083" \
+  --add-host=host.containers.internal:host-gateway \
+  -e SYSMON_SERVERS="compute1:http://host.containers.internal:8084,console:http://192.168.88.5:8083" \
   --restart unless-stopped \
   sysmon