fix: correct VM disk monitoring documentation for PVE 9

TESTED AND CONFIRMED: API tokens CAN access guest agent data on PVE 9!
- Created test tokens and verified they work
- Guest agent API returns proper disk usage data
- The cluster/resources endpoint shows disk=0 but that's not what Pulse uses
- Pulse correctly fetches data via /nodes/{node}/qemu/{vmid}/agent/get-fsinfo

The misinformation about PVE 9 not working was completely wrong. It does work when properly configured with PVEAuditor role which includes VM.GuestAgent.Audit permission.

docs/FAQ.md

@@ -91,11 +91,11 @@ Reduce `metricsRetentionDays` in settings and restart
 ### Why do VMs show 0% disk usage?
 This is usually one of these issues:
 
-**Proxmox 9**: VM disk monitoring has mixed results:
-- Some users report it working fine, especially in cluster configurations
-- Others see 0% disk usage due to API token limitations
-- VM.Monitor permission was removed (replaced with VM.GuestAgent.Audit)
-- If you're seeing 0%, there's currently no reliable workaround
+**Proxmox 9**: VM disk monitoring should work with proper setup:
+- API tokens CAN access guest agent data (confirmed working)
+- Ensure your token has proper permissions (PVEAuditor role includes VM.GuestAgent.Audit)
+- The `/cluster/resources` endpoint shows disk=0 but Pulse fetches actual data via guest agent API
+- If you see 0%, check: guest agent installed/running, token permissions, and Pulse logs for errors
 - Note: Container (LXC) disk usage always works fine
 
 **Proxmox 8**: Check that:

internal/api/config_handlers.go

@@ -2164,18 +2164,18 @@ else
     fi
     
     echo ""
-    echo "⚠️  NOTE: Proxmox 9 VM Disk Usage"
-    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
-    echo "VM disk usage may show 0% on Proxmox 9 with API tokens."
+    echo "✓ VM Disk Monitoring on Proxmox 9"
+    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+    echo "VM disk monitoring DOES work on Proxmox 9 with API tokens!"
     echo ""
-    echo "This appears to be a Proxmox limitation where guest agent data"
-    echo "may not be accessible to API tokens in some configurations."
+    echo "The PVEAuditor role includes VM.GuestAgent.Audit permission"
+    echo "which allows reading guest agent data for disk usage."
     echo ""
-    echo "Results vary:"
-    echo "  • Some users report it works, especially in cluster setups"
-    echo "  • Others see 0% disk usage for VMs"
-    echo "  • Container (LXC) disk usage always works correctly"
-    echo "  • If you see 0%, try configuring as a cluster if possible"
+    echo "If VMs show 0% disk usage:"
+    echo "  • Ensure qemu-guest-agent is installed and running in the VM"
+    echo "  • Check that the token has PVEAuditor role applied"
+    echo "  • Verify with: qm agent <VMID> get-fsinfo"
+    echo "  • Container (LXC) disk usage always works"
     echo ""
     echo "Note: qemu-guest-agent must be installed in VMs for any disk"
     echo "monitoring to work. The data exists but token access is restricted."

internal/monitoring/monitor.go

@@ -988,7 +988,7 @@ func (m *Monitor) pollVMsAndContainersEfficient(ctx context.Context, instanceNam
 								log.Info().
 									Str("instance", instanceName).
 									Str("vm", res.Name).
-									Msg("• Proxmox 9: API tokens may not be able to access guest agent data")
+									Msg("• Check token has PVEAuditor role (includes VM.GuestAgent.Audit on PVE 9)")
 								log.Info().
 									Str("instance", instanceName).
 									Str("vm", res.Name).
@@ -996,7 +996,7 @@ func (m *Monitor) pollVMsAndContainersEfficient(ctx context.Context, instanceNam
 								log.Info().
 									Str("instance", instanceName).
 									Str("vm", res.Name).
-									Msg("• Some PVE 9 users report it works in cluster configs, but results vary")
+									Msg("• Verify guest agent is installed and running inside the VM")
 							} else {
 								log.Debug().
 									Err(err).
@@ -1370,7 +1370,7 @@ func (m *Monitor) pollVMsWithNodes(ctx context.Context, instanceName string, cli
 						log.Info().
 							Str("instance", instanceName).
 							Str("vm", vm.Name).
-							Msg("• Proxmox 9: API tokens may not be able to access guest agent data")
+							Msg("• Check token has PVEAuditor role (includes VM.GuestAgent.Audit on PVE 9)")
 						log.Info().
 							Str("instance", instanceName).
 							Str("vm", vm.Name).
@@ -1378,7 +1378,7 @@ func (m *Monitor) pollVMsWithNodes(ctx context.Context, instanceName string, cli
 						log.Info().
 							Str("instance", instanceName).
 							Str("vm", vm.Name).
-							Msg("• Some PVE 9 users report it works in cluster configs, but results vary")
+							Msg("• Verify guest agent is installed and running inside the VM")
 					} else {
 						log.Debug().
 							Err(err).