feat: 新增多个电力集团采购平台爬虫

- 新增4个电力集团采购平台爬虫：
  * 中国大唐集团电子商务平台 (CdtCrawler)
  * 大连能源采购平台 (CeicCrawler)
  * 华润守正采购交易平台 (SzecpCrawler)
- 更新 BidCrawlerService，集成新的爬虫到爬虫任务中
- 添加环境变量示例文件 .env.example，包含数据库和代理配置
- 优化 .env 文件，添加代理配置示例
- 为所有新爬虫添加完整的单元测试文件
- 使用与现有爬虫相同的反检测策略（人类行为模拟）
- 支持分页抓取，每个平台最多抓取5页数据
- 统一的错误处理机制，单个爬虫失败不影响其他爬虫执行

src/crawler/services/ceic_target.ts

@@ -0,0 +1,168 @@
+import * as puppeteer from 'puppeteer';
+import { Logger } from '@nestjs/common';
+import { ChdtpResult } from './chdtp_target';
+
+// 模拟人类鼠标移动
+async function simulateHumanMouseMovement(page: puppeteer.Page) {
+  const viewport = page.viewport();
+  if (!viewport) return;
+
+  const movements = 5 + Math.floor(Math.random() * 5); // 5-10次随机移动
+
+  for (let i = 0; i < movements; i++) {
+    const x = Math.floor(Math.random() * viewport.width);
+    const y = Math.floor(Math.random() * viewport.height);
+    
+    await page.mouse.move(x, y, {
+      steps: 10 + Math.floor(Math.random() * 20) // 10-30步，使移动更平滑
+    });
+    
+    // 随机停顿 100-500ms
+    await new Promise(r => setTimeout(r, 100 + Math.random() * 400));
+  }
+}
+
+// 模拟人类滚动
+async function simulateHumanScrolling(page: puppeteer.Page) {
+  const scrollCount = 3 + Math.floor(Math.random() * 5); // 3-7次滚动
+
+  for (let i = 0; i < scrollCount; i++) {
+    const scrollDistance = 100 + Math.floor(Math.random() * 400); // 100-500px
+    
+    await page.evaluate((distance) => {
+      window.scrollBy({
+        top: distance,
+        behavior: 'smooth'
+      });
+    }, scrollDistance);
+
+    // 随机停顿 500-1500ms
+    await new Promise(r => setTimeout(r, 500 + Math.random() * 1000));
+  }
+
+  // 滚动回顶部
+  await page.evaluate(() => {
+    window.scrollTo({ top: 0, behavior: 'smooth' });
+  });
+  await new Promise(r => setTimeout(r, 1000));
+}
+
+export const CeicCrawler = {
+  name: '大连能源采购平台',
+  url: 'https://ceic.dlnyzb.com/3001',
+  baseUrl: 'https://ceic.dlnyzb.com',
+
+  async crawl(browser: puppeteer.Browser): Promise<ChdtpResult[]> {
+    const logger = new Logger('CeicCrawler');
+    const page = await browser.newPage();
+
+    const username = process.env.PROXY_USERNAME;
+    const password = process.env.PROXY_PASSWORD;
+    if (username && password) {
+      await page.authenticate({ username, password });
+    }
+
+    await page.evaluateOnNewDocument(() => {
+      Object.defineProperty(navigator, 'webdriver', { get: () => false });
+      Object.defineProperty(navigator, 'language', { get: () => 'zh-CN' });
+      Object.defineProperty(navigator, 'plugins', { get: () => [1, 2, 3, 4, 5] });
+    });
+
+    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36');
+    await page.setViewport({ width: 1920, height: 1080 });
+
+    const allResults: ChdtpResult[] = [];
+    let currentPage = 1;
+    const maxPages = 5;
+
+    try {
+      logger.log(`Navigating to ${this.url}...`);
+      await page.goto(this.url, { waitUntil: 'networkidle2', timeout: 60000 });
+
+      // 模拟人类行为
+      logger.log('Simulating human mouse movements...');
+      await simulateHumanMouseMovement(page);
+      
+      logger.log('Simulating human scrolling...');
+      await simulateHumanScrolling(page);
+
+      while (currentPage <= maxPages) {
+        logger.log(`Processing page ${currentPage}...`);
+
+        // Wait for content to load - MUI list items
+        await page.waitForFunction(() => {
+          return document.querySelectorAll('li.MuiListItem-root').length > 0;
+        }, { timeout: 60000 }).catch(() => logger.warn('Content not found. Site might be slow.'));
+
+        const pageResults = await page.evaluate(() => {
+          const results: { title: string; dateStr: string; url: string }[] = [];
+
+          // Extract from MUI list items
+          const listItems = Array.from(document.querySelectorAll('li.MuiListItem-root'));
+          listItems.forEach(item => {
+            // Find the title link
+            const titleLink = item.querySelector('a.css-1vdw90h');
+            const title = titleLink?.textContent?.trim() || '';
+            const href = titleLink?.getAttribute('href') || '';
+
+            // Find the publish date - look for text containing "发布时间："
+            const paragraphs = Array.from(item.querySelectorAll('p'));
+            let dateStr = '';
+            for (const p of paragraphs) {
+              const text = p.textContent || '';
+              if (text.includes('发布时间：')) {
+                dateStr = text.replace('发布时间：', '').trim();
+                break;
+              }
+            }
+
+            if (title.length >= 5 && href) {
+              results.push({ title, dateStr, url: href });
+            }
+          });
+
+          return results;
+        });
+
+        if (pageResults.length === 0) {
+          logger.warn(`No results found on page ${currentPage}. Extraction failed.`);
+          break;
+        }
+
+        allResults.push(...pageResults.map(r => ({
+          title: r.title,
+          publishDate: r.dateStr ? new Date(r.dateStr) : new Date(),
+          url: r.url
+        })));
+
+        logger.log(`Extracted ${pageResults.length} items.`);
+
+        // Pagination: look for next page button in MUI pagination
+        const nextButton = await page.$('a[aria-label="Go to next page"]');
+        if (!nextButton) break;
+
+        await nextButton.click();
+        await new Promise(r => setTimeout(r, 3000));
+        
+        // 模拟人类行为
+        logger.log('Simulating human mouse movements...');
+        await simulateHumanMouseMovement(page);
+        
+        logger.log('Simulating human scrolling...');
+        await simulateHumanScrolling(page);
+        
+        currentPage++;
+      }
+
+      return allResults;
+
+    } catch (error) {
+      logger.error(`Crawl failed: ${error.message}`);
+      return allResults;
+    } finally {
+      if (page) await page.close();
+    }
+  },
+
+  extract() { return []; }
+};