Add plan execution mode, game ID, and version to health endpoint

- Add executionMode and gameId columns to StreamPlan schema
- Add migration for new columns
- Support executionMode/gameId in plan create and update endpoints
- Add version field to health check response from package.json

prisma/migrations/migration_lock.toml

@@ -0,0 +1,3 @@
+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "sqlite"