refactor: 消除 es-toolkit/compat 依赖，isArray/isObject 替换为原生实现

src/server/checker/config-loader.ts

@@ -1,5 +1,4 @@
 import { isNumber, isPlainObject, isString } from "es-toolkit";
-import { isArray } from "es-toolkit/compat";
 import { dirname, resolve } from "node:path";
 
 import type { ConfigValidationIssue } from "./schema/issues";
@@ -151,7 +150,7 @@ function resolveTarget(
 
 function validateConfig(config: RawProbeConfig): ConfigValidationIssue[] {
   const issues: ConfigValidationIssue[] = [];
-  if (!isArray(config.targets) || config.targets.length === 0) {
+  if (!Array.isArray(config.targets) || config.targets.length === 0) {
     issues.push(issue("required", "targets", "配置文件必须包含至少一个 target"));
     return issues;
   }