feat: 新增 target description 字段，收紧 id/name 长度，调整延迟列和名称列

src/server/checker/runner/http/execute.ts

@@ -112,6 +112,7 @@ export class HttpChecker implements CheckerDefinition<ResolvedHttpTarget> {
     const maxBodyBytes = parseSize(t.http.maxBodyBytes ?? httpDefaults?.maxBodyBytes ?? "100MB");
 
     return {
+      description: null,
       expect: target.expect as HttpExpectConfig | undefined,
       group: target.group ?? "default",
       http: {