feat(core): config, job queue, range media serving, feature composition

Adds aclRepo to @stc/db for canView.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/src/index.ts

@@ -0,0 +1,4 @@
+export { loadConfig } from "./config";
+export { createJobQueue } from "./jobs";
+export { serveMedia, contentType, contentDisposition } from "./media";
+export { createApp, canView, type Routes } from "./app";