feat: 添加爬虫状态更新中的显示支持

在爬虫状态列中增加"正在更新"状态显示，并在爬虫过程中更新状态

src/crawler/crawler.controller.ts

@@ -49,7 +49,17 @@ export class CrawlerController {
     this.crawlingSources.add(sourceName);
 
     try {
+      // 设置状态为正在更新（count = -1）
+      await this.crawlerService.updateCrawlStatus(sourceName, -1);
+
       const result = await this.crawlerService.crawlSingleSource(sourceName);
+
+      // 更新状态为实际数量
+      await this.crawlerService.updateCrawlStatus(
+        sourceName,
+        result.success ? result.count : 0,
+      );
+
       return result;
     } finally {
       this.crawlingSources.delete(sourceName);