Content: frame texture maps, scene passes, BlockCam layer prep

- Generated _normal/_height maps for all frame photo textures (DeepBump)
- The Room: picture frame pass; Lobby/Test Map scene passes
- AudioMixer: unmute group
- New layer 8 "BlockCam" (TagManager) + Main Camera culling mask includes it

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ProjectSettings/TagManager.asset

@@ -18,7 +18,7 @@ TagManager:
   - UI
   - 
   - Radar
-  - 
+  - BlockCam
   - 
   - 
   -