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/screenshots.ts

@@ -9,7 +9,7 @@ import { processScreenshot, isAllowedMimeType } from "@/lib/image-processing"
 const MAX_SCREENSHOTS_PER_ENTRY = 2
 const MAX_UPLOAD_SIZE = 10 * 1024 * 1024 // 10 MB raw
 
-export const screenshotRoutes = new Elysia({ prefix: "/performance" })
+export const screenshotRoutes = new Elysia({ prefix: "/performance", detail: { tags: ["Performance"] } })
 
   // ── Upload screenshots ─────────────────────────────────────────
   .post(