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

src/server/app.ts

@@ -84,13 +84,7 @@ function handleApiRoute(url: URL, request: Request, store: ProbeStore, mode: Run
   return jsonResponse(createApiError("API route not found", 404), { method, mode, status: 404 });
 }
 
-function handleHistory(
-  idStr: string,
-  url: URL,
-  method: string,
-  store: ProbeStore,
-  mode: RuntimeMode,
-): Response {
+function handleHistory(idStr: string, url: URL, method: string, store: ProbeStore, mode: RuntimeMode): Response {
   const id = Number(idStr);
 
   if (!Number.isInteger(id) || id <= 0) {
@@ -118,13 +112,7 @@ function handleHistory(
   return jsonResponse(results, { method, mode });
 }
 
-function handleTrend(
-  idStr: string,
-  url: URL,
-  method: string,
-  store: ProbeStore,
-  mode: RuntimeMode,
-): Response {
+function handleTrend(idStr: string, url: URL, method: string, store: ProbeStore, mode: RuntimeMode): Response {
   const id = Number(idStr);
 
   if (!Number.isInteger(id) || id <= 0) {