Database-level multi-library support #48 (#58)

* feat: start of library backends

* feat: update backend routes and create initializer

* feat: add legacy library creation

* fix: resolve frontend type errors

* fix: runtime errors

* fix: lint

server/api/v1/admin/import/game/index.get.ts

@@ -6,5 +6,10 @@ export default defineEventHandler(async (h3) => {
   if (!allowed) throw createError({ statusCode: 403 });
 
   const unimportedGames = await libraryManager.fetchAllUnimportedGames();
-  return { unimportedGames };
+  const iterableUnimportedGames = Object.entries(unimportedGames)
+    .map(([libraryId, gameArray]) =>
+      gameArray.map((e) => ({ game: e, library: libraryId })),
+    )
+    .flat();
+  return { unimportedGames: iterableUnimportedGames };
 });