feat(scene): add scene editor, executor and fakes (phase 1)

Introduce the scene module skeleton that satisfies phase 1 exit conditions for
tzh's responsibility in project_plan.md section 6.5: scene list, editor and Fake-driven
execution that can be tested independently.

Domain layer (domain/):
- Scene, SceneAction (SocketPower / InfraredKey), SceneIcon, SceneColor
- SceneExecutionResult with per-action outcome aggregation
- SceneRepository port (observe/get/create/update/delete, provider-isolated)
- SceneExecutor port (sequential execution, per-action failure continues)

Fakes (testing/fakes/):
- FakeSceneRepository: in-memory, provider-isolated, seeds local-experience catalog
- FakeSceneExecutor: drives existing SocketGateway/InfraredGateway fakes,
  rejects concurrent execution of the same scene

Android app (android/app/):
- SceneListScreen / SceneListViewModel: list, empty state, delete confirm
- SceneEditorScreen / SceneEditorViewModel: name/icon/color, action add/remove/reorder
- SceneExecutionScreen / SceneExecutionViewModel: run, progress, per-action summary
- SceneRoutes + NavGraphBuilder extensions wired into ABoxManagerApp
- SceneModule (debug) binds FakeSceneRepository, FakeSceneExecutor and a
  LocalProfileId qualifier that feat/provider-login will retire later

Build (settings.gradle.kts):
- Apply foojay-resolver-convention so the JVM 17 toolchain is auto-provisioned

Resources: zh-rCN / en strings for all scene surfaces
Tests: 20 unit tests covering repository isolation, CRUD, executor ordering,
failure continuation and concurrent-execution rejection

settings.gradle.kts

@@ -12,6 +12,10 @@ pluginManagement {
     }
 }
 
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {