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-storage.ts

@@ -5,7 +5,7 @@ import { eq, sql, and, ilike, desc } from "drizzle-orm"
 import { requireAdmin } from "@/lib/auth/guard"
 import { deleteObject, isR2Configured } from "@/lib/storage"
 
-export const adminStorageRoutes = new Elysia({ prefix: "/admin/storage" })
+export const adminStorageRoutes = new Elysia({ prefix: "/admin/storage", detail: { tags: ["Admin"] } })
 
   // ── GET /stats ──────────────────────────────────────────────────
   .get(