feat: 增强 expect 规则系统，支持多种 body 校验方法和操作符

- 新增 body 分组校验：contains、regex、json（JSONPath）、css（CSS选择器）、xpath
- 新增操作符系统：equals、contains、match、empty、exists、gte、lte、gt、lt
- 新增 headers 响应头校验
- 引入 cheerio、xpath、@xmldom/xmldom 依赖
- BREAKING: expect.bodyContains 迁移至 expect.body.contains

tests/server/checker/engine.test.ts

@@ -56,7 +56,9 @@ describe("ProbeEngine", () => {
   test("单次拨测写入数据库", async () => {
     const engine = new ProbeEngine(store, [target]);
     // 手动调用 probeGroup 不启动 timer
-    const probeGroup = (engine as unknown as { probeGroup: (t: ResolvedTarget[]) => Promise<void> }).probeGroup.bind(engine);
+    const probeGroup = (engine as unknown as { probeGroup: (t: ResolvedTarget[]) => Promise<void> }).probeGroup.bind(
+      engine,
+    );
     await probeGroup([target]);
 
     const dbTargets = store.getTargets();
@@ -78,7 +80,9 @@ describe("ProbeEngine", () => {
     store.syncTargets([target, badTarget]);
 
     const engine = new ProbeEngine(store, [target, badTarget]);
-    const probeGroup = (engine as unknown as { probeGroup: (t: ResolvedTarget[]) => Promise<void> }).probeGroup.bind(engine);
+    const probeGroup = (engine as unknown as { probeGroup: (t: ResolvedTarget[]) => Promise<void> }).probeGroup.bind(
+      engine,
+    );
     await probeGroup([target, badTarget]);
 
     const dbTargets = store.getTargets();