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/Scenes/Testings/MainMenu.unity.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 2a1ec0c1f9a64054f95911d1cda97f6e
+DefaultImporter:
+  externalObjects: {}
+  userData: 
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Assets/_Game/Scenes/Testings/New Scene.unity

@@ -183,7 +183,7 @@ Camera:
     height: 1
   near clip plane: 0.1
   far clip plane: 5000
-  field of view: 10
+  field of view: 40
   orthographic: 0
   orthographic size: 10
   m_Depth: -1
@@ -210,7 +210,7 @@ Transform:
   m_GameObject: {fileID: 265623115}
   serializedVersion: 2
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: -0.19243693, y: -1.6213, z: -64}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
   m_Children: []