feat(monitor): add playback management flow

frontends/apps/simple-platform-vue/src/api/workspaceToolbar.ts

@@ -19,6 +19,8 @@ export type DisplayKey = 'labels' | 'primitives' | 'cars'
 
 export interface ToolbarRecordingEntry {
   fileName: string
+  /** 用户可编辑的显示名（旁挂 .meta.json，决策 A-方案2）；为空时回退到 fileName。 */
+  displayName: string
   fileSizeBytes: number
   fileWriteTime: string
   note: string