feat(nodes): live CPU/RAM/disk monitoring in the node list

- node-agent: internal/metrics — read CPU% (GetSystemTimes), RAM (GlobalMemoryStatusEx),
  disk used%/total (GetDiskFreeSpaceEx) via stdlib kernel32 (no external dep; windows
  build + non-windows stub). Heartbeat now reports cpu_pct/ram_available_mb/disk_used_pct/
  disk_total_gb + ae_running.
- render-svc: heartbeat persists last_disk_pct + disk_total_gb (migration 29); RenderNode
  model + node SELECT/scan carry them.
- admin: rewrite NodesTable to the real RenderNode shape (fixes a pre-existing items/V2Node
  mismatch that left the list empty) + a CPU/RAM/disk bars column + stale-heartbeat flag.
- assets-bundle ingestion: ProjectMediaBundle (jszip) auto-maps project.zip → project/scene
  image/demo/colour + music; PatchProject gains image/full_demo/shared_colors_svg.
- scan: RGBA (4-number) colours recognised + frshare single-int controls detected.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/render/internal/db/db.go

@@ -64,8 +64,8 @@ func (s *Store) GetNodeByID(ctx context.Context, id uuid.UUID) (*models.RenderNo
 		       lifetime_task_count, lifetime_crash_count, consecutive_failures,
 		       priority, is_active, accepts_new_jobs,
 		       last_maintenance_at, next_maintenance_at, maintenance_reason,
-		       cached_template_md5s, cache_used_gb, created_at, updated_at
-		FROM render.render_nodes WHERE id = $1`, id)
+		       cached_template_md5s, cache_used_gb, created_at, updated_at, last_disk_pct, disk_total_gb
+FROM render.render_nodes WHERE id = $1`, id)
 	if err != nil {
 		return nil, err
 	}
@@ -158,13 +158,15 @@ func (s *Store) UpdateNodeHeartbeat(ctx context.Context, nodeID uuid.UUID, req *
 		  last_heartbeat_at = NOW(),
 		  last_cpu_pct = $2,
 		  last_ram_available_mb = $3,
-		  ae_running = COALESCE($4, ae_running),
-		  current_job_id = $5,
-		  current_frame_job_id = $6,
+		  last_disk_pct = $4,
+		  disk_total_gb = COALESCE($5, disk_total_gb),
+		  ae_running = COALESCE($6, ae_running),
+		  current_job_id = $7,
+		  current_frame_job_id = $8,
 		  updated_at = NOW()
-		WHERE id = $7`,
-		req.Status, req.CPUPct, req.RAMAvailableMB, req.AERunning,
-		req.CurrentJobID, nil, nodeID,
+		WHERE id = $9`,
+		req.Status, req.CPUPct, req.RAMAvailableMB, req.DiskUsedPct, req.DiskTotalGB,
+		req.AERunning, req.CurrentJobID, nil, nodeID,
 	)
 	return err
 }
@@ -846,6 +848,7 @@ func scanNodes(rows pgx.Rows) ([]*models.RenderNode, error) {
 			&n.Priority, &n.IsActive, &n.AcceptsNewJobs,
 			&n.LastMaintenanceAt, &n.NextMaintenanceAt, &n.MaintenanceReason,
 			&n.CachedTemplateMD5s, &n.CacheUsedGB, &n.CreatedAt, &n.UpdatedAt,
+			&n.LastDiskPct, &n.DiskTotalGB,
 		); err != nil {
 			return nil, err
 		}

services/render/internal/models/models.go

@@ -112,6 +112,8 @@ type RenderNode struct {
 	LastHeartbeatAt     *time.Time `json:"last_heartbeat_at,omitempty"`
 	LastCPUPct          *int       `json:"last_cpu_pct,omitempty"`
 	LastRAMAvailableMB  *int       `json:"last_ram_available_mb,omitempty"`
+	LastDiskPct         *int       `json:"last_disk_pct,omitempty"`
+	DiskTotalGB         *int       `json:"disk_total_gb,omitempty"`
 	AERunning           bool       `json:"ae_running"`
 	LifetimeTaskCount   int64      `json:"lifetime_task_count"`
 	LifetimeCrashCount  int        `json:"lifetime_crash_count"`
@@ -369,6 +371,8 @@ type NodeHeartbeatRequest struct {
 	Status         string     `json:"status"`
 	CPUPct         *int       `json:"cpu_pct"`
 	RAMAvailableMB *int       `json:"ram_available_mb"`
+	DiskUsedPct    *int       `json:"disk_used_pct"`
+	DiskTotalGB    *int       `json:"disk_total_gb"`
 	AERunning      *bool      `json:"ae_running"`
 	CurrentJobID   *uuid.UUID `json:"current_job_id"`
 	CurrentFrame   *int       `json:"current_frame"`