fix: treat NULL premium as non-premium for logged-out video list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/graphql/resolvers/videos.ts

@@ -28,6 +28,8 @@ import {
   lt,
   gte,
   arrayContains,
+  isNull,
+  or,
   type SQL,
 } from "drizzle-orm";
 import { requireAdmin } from "../../lib/acl";
@@ -101,7 +103,7 @@ builder.queryField("videos", (t) =>
       const offset = args.offset ?? 0;
 
       const conditions: SQL<unknown>[] = [lte(videos.upload_date, new Date())];
-      if (!ctx.currentUser) conditions.push(eq(videos.premium, false));
+      if (!ctx.currentUser) conditions.push(or(eq(videos.premium, false), isNull(videos.premium))!);
       if (args.featured !== null && args.featured !== undefined) {
         conditions.push(eq(videos.featured, args.featured));
       }