feat: 项目级成本预算系统（按模型×token 精确计费 + 超额自动暂停）

精确到项目级的成本/预算护栏，成本按「模型 × token 用量」折算（⑧ ★ 新特性）。

定价（单源）：
- src/model/pricing.ts：MODEL_PRICES（opus/sonnet/haiku，USD/1M token，分
  input/output/cacheRead/cacheWrite）+ computeCost/addUsage，前缀容错、未知模型记 0

token 捕获链（worker → daemon）：
- cc.ts：从 SDK result 消息抓 usage，跨 resume/回退累计；CCResult.usage
- runner/reviewer：结果对象带 usage + modelUsed
- protocol.ts：新增 'usage' outbox 记录；pipeline 每次 CC（executor/复审/planner/
  conflict）后 emit usage（worker 侧写文件，不碰 DB）
- ingest.ts：'usage' → store.setRunUsage（累加、按模型折算）→ enforceBudget

存储 + 护栏：
- schema/db.ts：runs.usage/cost_usd、projects.budget_usd/budget_period（幂等迁移）
- store.ts：setRunUsage（累加）、projectSpend、costSummary（按项目/模型/总计）、
  enforceBudget（超额 → 置 paused + 广播 budget.exceeded）
- 编排器天然停领：orchestrator 既有「跳过 paused 项目」即生效，无需改

API：
- GET /api/usage：并入成本明细 {session,weekly,cost:{period,total,byProject,byModel}}，?period/?project
- GET /api/health：{ok,db,inflight,at}
- PATCH /api/projects：支持 budgetUsd/budgetPeriod

前端：
- adapt.js：agentSummary 用真实成本/token；adaptProject 透传预算字段
- app.jsx：budget.exceeded → 告警 toast
- ConfigPanel：预算 $ + 周期（day|month）受控输入

验证：typecheck 干净；206 测试通过（含新增 budget.test.ts 4 例：定价折算/累加/
costSummary/enforceBudget）；前端 build + 截图确认预算输入渲染、0 错误。
注：生效需合并后重启 daemon（迁移幂等加列、向后兼容旧库）。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/budget.test.ts

@@ -0,0 +1,64 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { Store } from '../src/store/index.js';
+import { computeCost, addUsage } from '../src/model/pricing.js';
+
+test('pricing: computeCost 按模型×token 折算（USD/1M）', () => {
+  // opus: in15 / out75 → 各 1M token = 15 + 75 = 90
+  assert.equal(computeCost('claude-opus-4-8', { input: 1_000_000, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }), 90);
+  // sonnet: in3 → 2M input = 6
+  assert.equal(computeCost('claude-sonnet-4-6', { input: 2_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }), 6);
+  // haiku: cacheRead 0.1 → 10M = 1
+  assert.equal(computeCost('claude-haiku-4-5', { input: 0, output: 0, cacheRead: 10_000_000, cacheWrite: 0 }), 1);
+  // 未知模型 → 0（不阻断）
+  assert.equal(computeCost('mystery-model', { input: 9_999_999, output: 0, cacheRead: 0, cacheWrite: 0 }), 0);
+  // 前缀匹配（容忍日期后缀）
+  assert.equal(computeCost('claude-opus-4-8-20260101', { input: 1_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }), 15);
+});
+
+test('pricing: addUsage 逐项累加', () => {
+  const a = { input: 1, output: 2, cacheRead: 3, cacheWrite: 4 };
+  assert.deepEqual(addUsage(a, a), { input: 2, output: 4, cacheRead: 6, cacheWrite: 8 });
+});
+
+test('store: setRunUsage 累加成本 + costSummary 聚合', () => {
+  const s = new Store(':memory:');
+  const p = s.createProject({ name: 'b', repoPath: '/tmp/b-' + Math.random() });
+  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'easy' });
+  const r = s.startRun(t.id, 'executor');
+
+  // 一个 run 内多次 CC 调用（executor + 复审）→ 累加
+  const c1 = s.setRunUsage(r.id, { input: 1_000_000, output: 0, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8');
+  assert.equal(c1, 15);
+  const c2 = s.setRunUsage(r.id, { input: 0, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8');
+  assert.equal(c2, 90);
+
+  const sum = s.costSummary('month');
+  assert.equal(sum.total, 90);
+  assert.equal(sum.byProject.length, 1);
+  assert.equal(sum.byProject[0].projectId, p.id);
+  assert.equal(sum.byProject[0].costUsd, 90);
+  assert.equal(sum.byProject[0].tokens, 2_000_000);
+  s.close();
+});
+
+test('store: enforceBudget 超额 → 暂停项目 + 广播 budget.exceeded', () => {
+  const s = new Store(':memory:');
+  const p = s.createProject({ name: 'b', repoPath: '/tmp/b-' + Math.random() });
+  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'easy' });
+  const r = s.startRun(t.id, 'executor');
+  s.setRunUsage(r.id, { input: 0, output: 1_000_000, cacheRead: 0, cacheWrite: 0 }, 'claude-opus-4-8'); // $75
+
+  // 无预算 → 不干预
+  assert.equal(s.enforceBudget(p.id), false);
+  assert.equal(s.getProject(p.id)!.status, 'active');
+
+  // 设 $50 上限 → 超额、暂停、发事件
+  s.patchProject(p.id, { budgetUsd: 50, budgetPeriod: 'month' });
+  assert.equal(s.enforceBudget(p.id), true);
+  assert.equal(s.getProject(p.id)!.status, 'paused');
+  const ev = s.listEvents(p.id).find((e) => e.type === 'budget.exceeded');
+  assert.ok(ev, '应有 budget.exceeded 事件');
+  assert.equal((ev!.payload as { budget: number }).budget, 50);
+  s.close();
+});