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

package.json

@@ -19,7 +19,9 @@
     "@aws-sdk/client-s3": "^3.1036.0",
     "@better-auth/drizzle-adapter": "^1.6.9",
     "@better-auth/passkey": "^1.6.9",
+    "@elysia/cron": "^1.4.2",
     "@elysia/eden": "^1.4.10",
+    "@elysia/openapi": "^1.4.15",
     "@serwist/expiration": "^9.5.11",
     "@serwist/next": "^9.5.11",
     "@serwist/precaching": "^9.5.11",