refactor: star rating (#26357)

* refactor: star rating

* transform rating 0 to null in controller dto

* migrate rating 0 to null

* deprecate rating -1

* rating type annotation

* update Rating type

server/src/schema/migrations/1771535611395-ConvertRating0ToNull.ts

@@ -0,0 +1,9 @@
+import { Kysely, sql } from 'kysely';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  await sql`UPDATE "asset_exif" SET "rating" = NULL WHERE "rating" = 0;`.execute(db);
+}
+
+export async function down(): Promise<void> {
+  // not supported
+}