fix: correct the misinformation about PVE 9 VM disk monitoring

Previous advice was completely wrong. The facts:
- VM.Monitor permission doesn't exist in PVE 9 (was removed)
- It was replaced with VM.GuestAgent.Audit
- But even with correct permissions, API tokens CANNOT access guest agent data on PVE 9
- This is Proxmox bug #1373 with NO working workaround for API tokens
- Users must accept 0% VM disk usage on PVE 9 until Proxmox fixes it upstream

Updated all documentation and error messages to reflect this reality instead of giving false hope about non-existent workarounds.

docs/FAQ.md

@@ -91,9 +91,10 @@ Reduce `metricsRetentionDays` in settings and restart
 ### Why do VMs show 0% disk usage?
 This is usually one of these issues:
 
-**Proxmox 9**: API tokens may have issues accessing guest agent data in some configurations. Workarounds:
-- Ensure your API token has VM.Monitor permission (re-run setup script if needed)
-- Accept that VM disk will show 0% if permissions aren't sufficient
+**Proxmox 9**: API tokens cannot access guest agent data due to a Proxmox bug (#1373). Unfortunately there's no workaround:
+- VM.Monitor permission was removed in PVE 9 (replaced with VM.GuestAgent.Audit)
+- Even with correct permissions, API tokens are blocked from accessing VM disk info
+- You'll have to accept that VM disk usage will show 0% until Proxmox fixes this
 - Note: Container (LXC) disk usage works fine
 
 **Proxmox 8**: Check that:

internal/api/config_handlers.go

@@ -2172,10 +2172,11 @@ else
     echo "is not accessible to API tokens, even with correct permissions."
     echo "Proxmox's own web UI also shows 0% for VM disk usage (bug #1373)."
     echo ""
-    echo "Workarounds:"
-    echo "  1. Ensure VM.Monitor permission is granted (should be done by this script)"
-    echo "  2. Container (LXC) disk usage works correctly with tokens"
-    echo "  3. If still not working, check Pulse logs for specific errors"
+    echo "Unfortunately, there are NO working workarounds for API tokens:"
+    echo "  1. VM.Monitor was removed in PVE 9 (replaced with VM.GuestAgent.Audit)"
+    echo "  2. Even with correct permissions, tokens can't access guest agent data"
+    echo "  3. Container (LXC) disk usage works correctly with tokens"
+    echo "  4. You'll have to accept 0% VM disk usage until Proxmox fixes this"
     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

@@ -992,11 +992,11 @@ func (m *Monitor) pollVMsAndContainersEfficient(ctx context.Context, instanceNam
 								log.Info().
 									Str("instance", instanceName).
 									Str("vm", res.Name).
-									Msg("• Proxmox 8: If you added this node before v4.7, re-run the setup script to add VM.Monitor permission")
+									Msg("• Proxmox 8: Re-run setup script to add VM.Monitor permission if added before v4.7")
 								log.Info().
 									Str("instance", instanceName).
 									Str("vm", res.Name).
-									Msg("Workaround: Grant VM.Monitor permission to your API token user or accept that VM disk usage will show 0%")
+									Msg("Unfortunately, there's no working workaround for API tokens on PVE 9 - VM disk will show 0%")
 							} else {
 								log.Debug().
 									Err(err).
@@ -1374,11 +1374,11 @@ func (m *Monitor) pollVMsWithNodes(ctx context.Context, instanceName string, cli
 						log.Info().
 							Str("instance", instanceName).
 							Str("vm", vm.Name).
-							Msg("• Proxmox 8: If you added this node before v4.7, re-run the setup script to add VM.Monitor permission")
+							Msg("• Proxmox 8: Re-run setup script to add VM.Monitor permission if added before v4.7")
 						log.Info().
 							Str("instance", instanceName).
 							Str("vm", vm.Name).
-							Msg("Workaround: Grant VM.Monitor permission to your API token user or accept that VM disk usage will show 0%")
+							Msg("Unfortunately, there's no working workaround for API tokens on PVE 9 - VM disk will show 0%")
 					} else {
 						log.Debug().
 							Err(err).