feat(hardware): collect and export licenses via Dell iDRAC10 Redfish walk

Implements the hardware.licenses[] contract section (v2.12, refreshed from
reanimator/core's hardware-ingest-contract.md — was v2.11 locally).

- models.License / HardwareConfig.Licenses mirror the contract field set.
- collector.collectLicenses() reads the standard DMTF
  /redfish/v1/LicenseService/Licenses collection during Redfish-walk replay;
  it's a generic DMTF resource, not Dell-specific, so any future vendor's
  Redfish walk gets license collection for free through
  ReplayRedfishFromRawPayloads.
- vendors/dell merges replayed Licenses like every other category.
- exporter.convertLicenses/dedupeLicenses wire hw.Licenses into the
  reanimator export directly (no canonical-devices merge — licenses have no
  physical identity to merge on), setting Present on every record from the
  start (per the ADL-049 round-trip lesson).
- chart viewer renders a licenses section in /chart/current.

Verified end-to-end on the PowerEdge R7715 (1TVFYL4) TSR: 3 system-level
licenses extracted and correctly exported/rendered.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/models/models.go

@@ -106,6 +106,7 @@ type HardwareConfig struct {
 	NetworkCards    []NIC            `json:"network_cards,omitempty"`
 	NetworkAdapters []NetworkAdapter `json:"network_adapters,omitempty"`
 	PowerSupply     []PSU            `json:"power_supplies,omitempty"`
+	Licenses        []License        `json:"licenses,omitempty"`
 }
 
 const (
@@ -357,6 +358,27 @@ type PSU struct {
 	ErrorDescription string               `json:"error_description,omitempty"`
 }
 
+// License represents a software/firmware license or feature-on-demand
+// activation (BMC advanced licenses, vGPU, RAID feature unlocks, CPU
+// feature-on-demand, etc). ComponentRef is empty for system-level licenses.
+type License struct {
+	Name         string    `json:"name"`
+	LicenseKey   string    `json:"license_key,omitempty"`
+	Vendor       string    `json:"vendor,omitempty"`
+	Type         string    `json:"type,omitempty"`
+	Feature      string    `json:"feature,omitempty"`
+	ComponentRef string    `json:"component_ref,omitempty"`
+	ActivatedAt  time.Time `json:"activated_at,omitempty"`
+	ExpiresAt    time.Time `json:"expires_at,omitempty"`
+	Present      bool      `json:"present"`
+	Status       string    `json:"status,omitempty"`
+
+	StatusCheckedAt  *time.Time           `json:"status_checked_at,omitempty"`
+	StatusChangedAt  *time.Time           `json:"status_changed_at,omitempty"`
+	StatusHistory    []StatusHistoryEntry `json:"status_history,omitempty"`
+	ErrorDescription string               `json:"error_description,omitempty"`
+}
+
 // GPU represents a graphics processing unit
 type GPU struct {
 	Slot             string `json:"slot"`