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/server/test/sse.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+import { EventBus } from "../src/http/sse";
+import { DEV_KEY, testApp } from "./helpers";
+
+describe("EventBus", () => {
+  it("序号自增并按 after 补读,淘汰后标记 gap", () => {
+    const bus = new EventBus(3);
+    for (let i = 0; i < 5; i++) bus.publish("t", { i });
+    expect(bus.latestSeq).toBe(5);
+    expect(bus.since(3).events.map((e) => e.seq)).toEqual([4, 5]);
+    expect(bus.since(3).gap).toBe(false);
+    expect(bus.since(1).gap).toBe(true);
+  });
+});
+
+describe("GET /api/v1/events", () => {
+  it("需要鉴权", async () => {
+    const { app } = testApp();
+    expect((await app.request("/api/v1/events")).status).toBe(401);
+  });
+
+  it("补读 after 之后的事件", async () => {
+    const { app, bus } = testApp();
+    bus.publish("a", 1);
+    bus.publish("b", 2);
+    const ac = new AbortController();
+    const res = await app.request("/api/v1/events?after=1", {
+      headers: { Authorization: `Bearer ${DEV_KEY}` },
+      signal: ac.signal,
+    });
+    expect(res.headers.get("content-type")).toContain("text/event-stream");
+    const reader = res.body!.getReader();
+    const { value } = await reader.read();
+    const text = new TextDecoder().decode(value);
+    expect(text).toContain("id: 2");
+    expect(text).toContain("event: b");
+    expect(text).not.toContain("event: a");
+    ac.abort();
+    await reader.cancel();
+  });
+});