feat: add OpenAPI support and in-process cron scheduler

- Install @elysia/openapi to auto-generate API docs at /api/openapi
- Install @elysia/cron for in-process scheduled jobs (orphan detection at 2am, storage cleanup at 3am)
- Add Scalar UI docs with 14 tag groups and Bearer JWT security scheme
- Add route-level detail annotations (tags, summaries) to all 30+ route files
- Upgrade crud-builder to accept optional tags config
- Keep HTTP cron endpoint as manual/admin fallback

lib/api/admin-comments.ts

@@ -11,7 +11,7 @@ import {
   requireAdmin,
 } from "@/lib/auth/guard"
 
-export const adminCommentRoutes = new Elysia({ prefix: "/admin" })
+export const adminCommentRoutes = new Elysia({ prefix: "/admin", detail: { tags: ["Admin"] } })
   .get(
     "/comments",
     async ({ query, request, set }) => {