Fix Runtime Health criteria: network, services, nvidia-fabricmanager

Network: green if at least one interface has IPv4 (drop PARTIAL state).

Bee Services: treat inactive as OK — oneshot services (bee-sshsetup,
bee-preflight, bee-network, bee-audit, etc.) complete successfully and
exit to inactive; only failed is a real problem.

nvidia-fabricmanager: add ExecCondition=bee-check-nvswitch drop-in so
the service is silently skipped (inactive, not failed) on systems
without NVSwitch hardware (e.g. H200 NVL with direct NVLink, no
NVSwitch chips). bee-check-nvswitch detects NVSwitch via lspci
(vendor 10de, class 0680).

bee-nvidia.service: add ConditionPathExists=/usr/local/bin/bee-nvidia-load
so the unit is a no-op if somehow present in a non-nvidia build.

bee-boot-status: read /etc/bee-gpu-vendor and exclude bee-nvidia from
CRITICAL/ALL on non-nvidia builds, preventing boot hang if the unit
is unexpectedly present.

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

audit/internal/platform/runtime.go

@@ -55,7 +55,6 @@ func (s *System) CollectRuntimeHealth(exportDir string) (schema.RuntimeHealth, e
 	if err == nil {
 		health.Interfaces = make([]schema.RuntimeInterface, 0, len(interfaces))
 		hasIPv4 := false
-		missingIPv4 := false
 		for _, iface := range interfaces {
 			outcome := "no_offer"
 			if len(iface.IPv4) > 0 {
@@ -63,8 +62,6 @@ func (s *System) CollectRuntimeHealth(exportDir string) (schema.RuntimeHealth, e
 				hasIPv4 = true
 			} else if strings.EqualFold(iface.State, "DOWN") {
 				outcome = "link_down"
-			} else {
-				missingIPv4 = true
 			}
 			health.Interfaces = append(health.Interfaces, schema.RuntimeInterface{
 				Name:    iface.Name,
@@ -73,17 +70,9 @@ func (s *System) CollectRuntimeHealth(exportDir string) (schema.RuntimeHealth, e
 				Outcome: outcome,
 			})
 		}
-		switch {
-		case hasIPv4 && !missingIPv4:
+		if hasIPv4 {
 			health.NetworkStatus = "OK"
-		case hasIPv4:
-			health.NetworkStatus = "PARTIAL"
-			health.Issues = append(health.Issues, schema.RuntimeIssue{
-				Code:        "dhcp_partial",
-				Severity:    "warning",
-				Description: "At least one interface did not obtain IPv4 connectivity.",
-			})
-		default:
+		} else {
 			health.NetworkStatus = "FAILED"
 			health.Issues = append(health.Issues, schema.RuntimeIssue{
 				Code:        "dhcp_failed",