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/agent/README.md

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+# @umt/agent
+
+Pi Agent 接入:AgentRuntimePort 封装、能力注册中心桥接、agent_run 持久化与测试用 fake 模型 provider。只通过显式白名单能力操作业务,不开放 bash/文件系统/任意网络。

packages/agent/package.json

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+{
+  "name": "@umt/agent",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "typecheck": "tsc -p tsconfig.json",
+    "test": "vitest run"
+  }
+}

packages/agent/src/index.ts

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+// @umt/agent 公开入口;W1 起在此导出实现
+export const PACKAGE_NAME = "@umt/agent";

packages/agent/test/index.test.ts

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+import { expect, it } from "vitest";
+import { PACKAGE_NAME } from "../src";
+
+it("包入口可加载", () => {
+  expect(PACKAGE_NAME).toBe("@umt/agent");
+});

packages/agent/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["src", "test"]
+}