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/game-stub.ts

@@ -1,7 +1,7 @@
 import { Elysia, t } from "elysia"
 import { ensureSteamGame } from "@/lib/steam/sync"
 
-export const gameStubRoutes = new Elysia({ prefix: "/games" }).post(
+export const gameStubRoutes = new Elysia({ prefix: "/games", detail: { tags: ["Games"] } }).post(
   "/stub",
   async ({ body, set }) => {
     const result = await ensureSteamGame(body.steamAppId)