feat: implement custom theme management

src/main/level/sublevels/keys.ts

@@ -5,6 +5,7 @@ export const levelKeys = {
   game: (shop: GameShop, objectId: string) => `${shop}:${objectId}`,
   user: "user",
   auth: "auth",
+  themes: "themes",
   gameShopCache: "gameShopCache",
   gameShopCacheItem: (shop: GameShop, objectId: string, language: string) =>
     `${shop}:${objectId}:${language}`,

src/main/level/sublevels/themes.ts

@@ -0,0 +1,7 @@
+import type { Theme } from "@types";
+import { db } from "../level";
+import { levelKeys } from "./keys";
+
+export const themes = db.sublevel<string, Theme>(levelKeys.themes, {
+  valueEncoding: "json",
+});