feat: 新增北京电力交易平台爬虫

- 新增 PowerbeijingCrawler 爬虫类，支持北京电力交易平台招标信息抓取
- 目标平台：https://www.powerbeijing-ec.com，专注于北京地区电力交易招标信息
- 使用正则表达式提取招标公告，支持标题、URL和发布日期解析
- 添加完整的人类行为模拟功能（鼠标移动、滚动）降低检测风险
- 支持分页抓取，最多抓取5页数据，使用 turnPage 函数进行翻页
- 添加完整的单元测试文件，确保爬虫功能正常
- 统一的错误处理机制，单个爬虫失败不影响整体任务执行

src/crawler/services/powerbeijing_target.spec.ts

@@ -0,0 +1,51 @@
+import { PowerbeijingCrawler } from './powerbeijing_target';
+import * as puppeteer from 'puppeteer';
+
+// Increase timeout to 60 seconds for network operations
+jest.setTimeout(60000*5);
+
+describe('PowerbeijingCrawler Real Site Test', () => {
+  let browser: puppeteer.Browser;
+
+  beforeAll(async () => {
+    browser = await puppeteer.launch({
+      headless: false, // Change to false to see browser UI
+      args: ['--no-sandbox', '--disable-setuid-sandbox'],
+    });
+  });
+
+  afterAll(async () => {
+    if (browser) {
+      await browser.close();
+    }
+  });
+
+  it('should visit website and list all found bid information', async () => {
+    console.log(`\nStarting crawl for: ${PowerbeijingCrawler.name}`);
+    console.log(`Target URL: ${PowerbeijingCrawler.url}`);
+    
+    const results = await PowerbeijingCrawler.crawl(browser);
+    
+    console.log(`\nSuccessfully found ${results.length} items:\n`);
+    console.log('----------------------------------------');
+    results.forEach((item, index) => {
+      console.log(`${index + 1}. [${item.publishDate.toLocaleDateString()}] ${item.title}`);
+      console.log(`   Link: ${item.url}`);
+      console.log('----------------------------------------');
+    });
+
+    // Basic assertions to ensure crawler is working
+    expect(results).toBeDefined();
+    expect(Array.isArray(results)).toBeTruthy();
+    // Warn but don't fail if site returns 0 items (could be empty or changed structure)
+    if (results.length === 0) {
+      console.warn('Warning: No items found. Check if website structure has changed or if list is currently empty.');
+    } else {
+       // Check data integrity of first item
+       const firstItem = results[0];
+       expect(firstItem.title).toBeTruthy();
+       expect(firstItem.url).toMatch(/^https?:\/\//);
+       expect(firstItem.publishDate).toBeInstanceOf(Date);
+    }
+  });
+});