feat(umu id override): add support for overriding UMU id

prisma/migrations/20241223022005_add_umu_id_to_game_version/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "GameVersion" ADD COLUMN     "umuIdOverride" TEXT;

prisma/schema/content.prisma

@@ -44,6 +44,7 @@ model GameVersion {
     platform        Platform
     launchCommand   String // Command to run to start. Platform-specific. Windows games on Linux will wrap this command in Proton/Wine
     setupCommand    String // Command to setup game (dependencies and such)
+    umuIdOverride   String?
     dropletManifest Json // Results from droplet
 
     versionIndex Int