feat: Addressables rules/sync tools, UI fixes, AddressKeys update

- Add AddressableRules.cs: single source of truth for prefix->group and prefix->label rules
- Add AddressableRuleSyncWindow.cs: scan/fix/export-CSV tool (BaseGames > Addressables > Rule Sync)
- AddressableBatchTool.cs: delegate DeriveGroupName to AddressableRules, remove duplicate PrefixGroupMap
- AddressKeys.cs: add Labels constants (Preload, Poolable, Enemy, BGM, SFX, Charms, Config, Weapon)
- Docs/Standards/AddressablesLabelSpec.md: new label naming & assignment spec
- Docs/Standards/AssetFolderSpec.md: update Addressables group strategy section
- SplashScreenController.cs: fix MainMenu loading flow
- BootFlowSetupWizard.cs / SceneScaffoldTools.cs: scene scaffold fixes
- PlayerInputActions: set UI/Point to Pass-Through type
- Persistent.unity: add BootSequencer to auto-load MainMenu on play
- EditorBuildSettings.asset: register scenes for build

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Assets/_Game/Scripts/Editor/Scene/SceneScaffoldTools.cs

@@ -202,8 +202,6 @@ namespace BaseGames.Editor
             AssignReference(cameraStateController, "_brain", brain);
             AssignReference(cameraStateController, "_impulseSource", impulseSource);
             AssignReference(cameraStateController, "_lookSystem", lookSystem);
-            AssignReference(cameraStateController, "_vcamA", vcamA);
-            AssignReference(cameraStateController, "_vcamB", vcamB);
             AssignAsset(cameraStateController, "_onPlayerSpawned", report, true, "EVT_PlayerSpawned");
             AssignAsset(cameraStateController, "_lensConfig",      report, false, "CAM_LensConfig", "LensConfig", "CameraLensConfig");