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/AddressableAssetsData/AssetGroups/Scenes.asset

@@ -17,8 +17,13 @@ MonoBehaviour:
     m_SerializedData: []
   m_GUID: bb063dcc2b7a95445ba989917306f188
   m_SerializeEntries:
+  - m_GUID: 2a1ec0c1f9a64054f95911d1cda97f6e
+    m_Address: Assets/_Game/Scenes/Testings/MainMenu.unity
+    m_ReadOnly: 0
+    m_SerializedLabels: []
+    FlaggedDuringContentUpdateRestriction: 0
   - m_GUID: 6372e5b8e07d7ae4eb37a184fc8e912d
-    m_Address: Scene_Persistent
+    m_Address: Assets/_Game/Scenes/Persistent.unity
     m_ReadOnly: 0
     m_SerializedLabels: []
     FlaggedDuringContentUpdateRestriction: 0