chore: scaffold monorepo and migrate uhd_web design system (W0-A)

- pnpm workspace: apps/{web,server}, packages/{contracts,db,domain,adapters,tasks,agent,testkit}
- server: Hono + zod-openapi, API Key auth with scopes, redacting pino logger, SSE event bus with replay, worker heartbeat
- db: Kysely + pg, file migrator, 0001_init (settings/api_key/audit_event/outbox_event)
- web: React Router 7 SPA console shell with 12 workspace placeholders, uhd_web tokens/ui/guard scripts
- docs: ADR-001 (Node over Deno), dev runbook, design system rules

Co-Authored-By: Claude Fable 5.1 <[email protected]>

packages/adapters/README.md

@@ -0,0 +1,3 @@
+# @umt/adapters
+
+外部系统适配层:qBittorrent、RSS、站点(观众 NexusPHP / 馒头 API)、TMDB、Emby 兼容服务器与文件系统。对上只暴露端口接口,凭证经 secret reference 注入,日志一律脱敏。