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]>

apps/web/app/lib/design-tokens.generated.ts

@@ -0,0 +1,68 @@
+// 由 scripts/gen-design-tokens.mjs 从 app/app.css 生成,不要手改;改了 app.css 跑 pnpm gen:tokens
+export const DESIGN_TOKENS = {
+  "fontSizes": [
+    "micro",
+    "label",
+    "meta",
+    "caption",
+    "body",
+    "control",
+    "lead",
+    "lead-lg",
+    "title-xs",
+    "title-sm",
+    "title",
+    "title-lg",
+    "headline-xs",
+    "headline-sm",
+    "headline",
+    "headline-lg",
+    "display-xs",
+    "display-sm",
+    "display",
+    "display-lg",
+    "display-xl",
+    "hero-stream",
+    "hero-stream-sm",
+    "hero-stream-md",
+    "detail-title",
+    "notfound-code",
+    "pricing-hero",
+    "pricing-title",
+    "auth-title",
+    "landing-hero",
+    "landing-platforms-title",
+    "landing-immersive-title",
+    "landing-service-hero",
+    "landing-service-title",
+    "landing-service-title-lg",
+    "landing-service-sub"
+  ],
+  "eases": [
+    "standard",
+    "spring",
+    "spring-soft",
+    "sheet",
+    "pop"
+  ],
+  "radii": [
+    "sm",
+    "md",
+    "lg",
+    "xl",
+    "2xl",
+    "3xl",
+    "4xl",
+    "tight",
+    "drawer",
+    "slab"
+  ],
+  "durations": [
+    "micro",
+    "base",
+    "layout",
+    "slow",
+    "hero",
+    "cinematic"
+  ]
+} as const;