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/config-loader.test.ts

@@ -43,6 +43,16 @@ describe("parseDuration", () => {
     expect(parseDuration("1.5s")).toBe(1500);
   });
 
+  test("解析小时", () => {
+    expect(parseDuration("2h")).toBe(7200000);
+    expect(parseDuration("1h")).toBe(3600000);
+  });
+
+  test("解析天", () => {
+    expect(parseDuration("7d")).toBe(604800000);
+    expect(parseDuration("1d")).toBe(86400000);
+  });
+
   test("拒绝非正整数毫秒结果", () => {
     expect(() => parseDuration("0ms")).toThrow("正整数毫秒");
     expect(() => parseDuration("1.5ms")).toThrow("正整数毫秒");
@@ -1214,4 +1224,51 @@ targets:
       "expect.status 是未知字段",
     );
   });
+
+  test("retention 默认值为 7d", async () => {
+    const configPath = join(tempDir, "retention-default.yaml");
+    await writeFile(
+      configPath,
+      `targets:
+  - name: "test"
+    type: http
+    http:
+      url: "http://example.com"
+`,
+    );
+    const config = await loadConfig(configPath);
+    expect(config.retentionMs).toBe(604800000);
+  });
+
+  test("retention 自定义值", async () => {
+    const configPath = join(tempDir, "retention-custom.yaml");
+    await writeFile(
+      configPath,
+      `runtime:
+  retention: "24h"
+targets:
+  - name: "test"
+    type: http
+    http:
+      url: "http://example.com"
+`,
+    );
+    const config = await loadConfig(configPath);
+    expect(config.retentionMs).toBe(86400000);
+  });
+
+  test("retention 非法格式抛出错误", async () => {
+    await expectConfigError(
+      "bad-retention.yaml",
+      `runtime:
+  retention: "7x"
+targets:
+  - name: "test"
+    type: http
+    http:
+      url: "http://example.com"
+`,
+      "无效的时长格式",
+    );
+  });
 });