chore: 更新.gitignore并添加新文件

在.gitignore中添加对*.png、*.log、*-lock.json、*.woff2文件的忽略规则，并新增OFL.txt文件。同时，添加vue.svg图标文件以支持前端展示。更新多个TypeScript文件以优化代码格式和增强可读性。

src/crawler/crawler.controller.ts

@@ -12,7 +12,7 @@ export class CrawlerController {
   getStatus() {
     return {
       isCrawling: this.isCrawling,
-      crawlingSources: Array.from(this.crawlingSources)
+      crawlingSources: Array.from(this.crawlingSources),
     };
   }
 
@@ -21,9 +21,9 @@ export class CrawlerController {
     if (this.isCrawling) {
       return { message: 'Crawl is already running' };
     }
-    
+
     this.isCrawling = true;
-    
+
     // We don't await this because we want it to run in the background
     // and return immediately, or we can await if we want to user to wait.
     // Given the requirement "Immediate Crawl", usually implies triggering it.
@@ -45,9 +45,9 @@ export class CrawlerController {
     if (this.crawlingSources.has(sourceName)) {
       return { message: `Source ${sourceName} is already being crawled` };
     }
-    
+
     this.crawlingSources.add(sourceName);
-    
+
     try {
       const result = await this.crawlerService.crawlSingleSource(sourceName);
       return result;