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/dashboard.ts

@@ -10,7 +10,7 @@ import {
 import { eq, count, sql, gte, and, desc } from "drizzle-orm";
 import { requireContributorOrAdmin } from "@/lib/auth/guard";
 
-export const dashboardRoutes = new Elysia({ prefix: "/dashboard" }).get(
+export const dashboardRoutes = new Elysia({ prefix: "/dashboard", detail: { tags: ["Dashboard"] } }).get(
   "/stats",
   async ({ request, set }) => {
     const guard = await requireContributorOrAdmin(request.headers);