feat: 基础设施加固 — 修复构建、数据保留、错误边界、bundle 拆分

- 修复 build script 引用已删除的 registerCheckers，恢复生产构建
- 生产入口添加 SIGINT/SIGTERM 优雅关闭（与 dev.ts 一致）
- 新增 runtime.retention 配置（默认 7d），ProbeStore.prune() 定时清理过期数据
- parseDuration 扩展支持 h/d 单位
- 新增前端 ErrorBoundary 组件，防止渲染错误白屏
- Vite codeSplitting.groups 拆分 vendor chunks（业务代码 1180KB → 47KB）
- 同步 delta specs 到主规范

tests/server/checker/store.test.ts

@@ -419,4 +419,87 @@ describe("ProbeStore", () => {
 
     freshStore.close();
   });
+
+  test("prune 删除过期数据", () => {
+    const pruneStore = new ProbeStore(join(tempDir, "prune.db"));
+    pruneStore.syncTargets([httpTarget]);
+    const t = pruneStore.getTargets()[0]!;
+
+    pruneStore.insertCheckResult({
+      durationMs: 100,
+      failure: null,
+      matched: true,
+      statusDetail: "200 OK",
+      targetId: t.id,
+      timestamp: "2020-01-01T00:00:00.000Z",
+    });
+    pruneStore.insertCheckResult({
+      durationMs: 100,
+      failure: null,
+      matched: true,
+      statusDetail: "200 OK",
+      targetId: t.id,
+      timestamp: new Date().toISOString(),
+    });
+
+    const deleted = pruneStore.prune(86400000);
+    expect(deleted).toBe(1);
+
+    const history = pruneStore.getHistory(t.id, "2000-01-01T00:00:00.000Z", "2099-12-31T23:59:59.999Z");
+    expect(history.total).toBe(1);
+
+    pruneStore.close();
+  });
+
+  test("prune 无过期数据返回 0", () => {
+    const pruneStore = new ProbeStore(join(tempDir, "prune-none.db"));
+    pruneStore.syncTargets([httpTarget]);
+    const t = pruneStore.getTargets()[0]!;
+
+    pruneStore.insertCheckResult({
+      durationMs: 100,
+      failure: null,
+      matched: true,
+      statusDetail: "200 OK",
+      targetId: t.id,
+      timestamp: new Date().toISOString(),
+    });
+
+    const deleted = pruneStore.prune(86400000);
+    expect(deleted).toBe(0);
+
+    pruneStore.close();
+  });
+
+  test("prune 不影响保留期内数据", () => {
+    const pruneStore = new ProbeStore(join(tempDir, "prune-keep.db"));
+    pruneStore.syncTargets([httpTarget]);
+    const t = pruneStore.getTargets()[0]!;
+
+    const now = Date.now();
+    pruneStore.insertCheckResult({
+      durationMs: 100,
+      failure: null,
+      matched: true,
+      statusDetail: "200 OK",
+      targetId: t.id,
+      timestamp: new Date(now - 3600000).toISOString(),
+    });
+    pruneStore.insertCheckResult({
+      durationMs: 200,
+      failure: null,
+      matched: true,
+      statusDetail: "200 OK",
+      targetId: t.id,
+      timestamp: new Date(now).toISOString(),
+    });
+
+    const deleted = pruneStore.prune(7200000);
+    expect(deleted).toBe(0);
+
+    const history = pruneStore.getHistory(t.id, "2000-01-01T00:00:00.000Z", "2099-12-31T23:59:59.999Z");
+    expect(history.total).toBe(2);
+
+    pruneStore.close();
+  });
 });