feat: Add player_configs feature and migrate user preferences

- Implemented player_configs table to store multiple player configurations per user.
- Migrated existing player settings from user_preferences to player_configs.
- Removed player-related columns from user_preferences.
- Added referral state fields to user for tracking referral rewards.
- Created migration scripts for database changes and data migration.
- Added test cases for app services and usage helpers.
- Introduced video job service interfaces and implementations.

buf.gen.yaml

@@ -9,7 +9,7 @@ plugins:
     opt:
       - paths=source_relative
   - remote: buf.build/community/stephenh-ts-proto
-    out: ../stream-ui/src/server/gen/proto
+    out: ../stream.ui/src/server/gen/proto
     opt:
       - env=node
       - esModuleInterop=true