feat(agent): 接通 plan 自动放行（autoApprovePlan）+ 项目配置可写

之前 auto_approve_plan/auto_approve_exec/checks 列与 Project 类型已存在，但
PatchProjectInput 不含它们 → 无法启用（dead config）。本次接通：
- PatchProjectInput + patchProject 支持 autoApprovePlan/autoApproveExec/checks
- API PATCH /projects 透传三字段
- ingest decompose-result：auto-approved + autoApprovePlan + 全 easy + 子任务≤5
  → store.decide(accept) 跳过 plan_review 直达 decomposed（默认关）

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

src/api/server.ts

@@ -98,6 +98,9 @@ export function buildServer(opts: ApiOptions): FastifyInstance {
     if (b.timeoutMs !== undefined) patch.timeoutMs = Number(b.timeoutMs);
     if (b.budgetUsd !== undefined) patch.budgetUsd = b.budgetUsd === null || b.budgetUsd === '' ? null : Number(b.budgetUsd);
     if (b.budgetPeriod !== undefined) patch.budgetPeriod = b.budgetPeriod as 'day' | 'month';
+    if (b.autoApprovePlan !== undefined) patch.autoApprovePlan = Boolean(b.autoApprovePlan);
+    if (b.autoApproveExec !== undefined) patch.autoApproveExec = Boolean(b.autoApproveExec);
+    if (b.checks !== undefined) patch.checks = b.checks === null || b.checks === '' ? null : String(b.checks);
     return projectOut(store.patchProject(id, patch));
   });