Add about menu service boundary

docs/modernization/roadmap.md

@@ -555,8 +555,9 @@ grid panel by mistake.
 `pano_cli plan-about-menu` exposes app-core planning for About menu help,
 about, what's-new, crash-test, and performance-test commands, including
 versioned what's-new labels, diagnostic gating, and no-canvas performance-test
-blocking before legacy dialogs, platform crash hooks, and Canvas performance
-strokes continue.
+blocking. `pp_app_core` now also owns an `AboutMenuServices` executor boundary,
+so `App::init_menu_about` dispatches through a legacy adapter before legacy
+dialogs, platform crash hooks, and Canvas performance strokes continue.
 `pp_platform_api` now owns a headless `PlatformServices` interface for
 startup storage path preparation, clipboard text, cursor visibility,
 virtual-keyboard visibility, UI-thread lifecycle hooks, render-context
@@ -1287,7 +1288,8 @@ Results:
   menu/panel planning as JSON automation.
 - `pp_app_core_about_menu_tests` passed, covering About/help/what's-new dialog
   routing, versioned what's-new labels, crash diagnostic gating, performance
-  workload metadata, and no-canvas performance-test blocking.
+  workload metadata, no-canvas performance-test blocking, dispatch through the
+  `AboutMenuServices` executor boundary, and no-op unavailable actions.
 - `pano_cli_plan_about_menu_news_smoke`,
   `pano_cli_plan_about_menu_performance_no_canvas_smoke`,
   `pano_cli_plan_about_menu_crash_disabled_smoke`, and