feat: 全量功能模块开发与集成测试修复

- 新增后端模块：Alert、APIAsset、Compliance、Lineage、Masking、Risk、SchemaChange、Unstructured、Watermark
- 新增前端模块页面与API接口
- 新增Alembic迁移脚本(002-014)覆盖全量业务表
- 新增测试数据生成脚本与集成测试脚本
- 修复metadata模型JSON类型导入缺失导致启动失败的问题
- 修复前端Alert/APIAsset页面request模块路径错误
- 更新docker-compose与开发计划文档

screenshots/capture.js

@@ -0,0 +1,44 @@
+const puppeteer = require('puppeteer');
+
+(async () => {
+  const browser = await puppeteer.launch({ headless: 'new', args: ['--no-sandbox', '--disable-setuid-sandbox'] });
+  const page = await browser.newPage();
+  await page.setViewport({ width: 1920, height: 1080 });
+
+  const BASE = 'http://localhost:5173';
+  const outDir = '/Users/nathan/Work/DataPointer/prop-data-guard/screenshots';
+
+  // 1. Login page
+  console.log('Capturing login...');
+  await page.goto(`${BASE}/login`, { waitUntil: 'networkidle2' });
+  await new Promise(r => setTimeout(r, 1000));
+  await page.screenshot({ path: `${outDir}/01_login.png`, fullPage: false });
+
+  // Login
+  await page.type('input[placeholder="用户名"]', 'admin');
+  await page.type('input[type="password"]', 'admin123');
+  await page.click('.login-btn');
+  await page.waitForNavigation({ waitUntil: 'networkidle2' });
+  await new Promise(r => setTimeout(r, 2000));
+
+  // Helper to capture a page
+  async function capture(path, filename, waitMs = 3000) {
+    console.log(`Capturing ${path}...`);
+    await page.goto(`${BASE}${path}`, { waitUntil: 'networkidle2' });
+    await new Promise(r => setTimeout(r, waitMs));
+    await page.screenshot({ path: `${outDir}/${filename}`, fullPage: false });
+  }
+
+  await capture('/dashboard', '02_dashboard.png');
+  await capture('/datasource', '03_datasource.png');
+  await capture('/metadata', '04_metadata.png');
+  await capture('/category', '05_category.png');
+  await capture('/project', '06_project.png');
+  await capture('/task', '07_task.png');
+  await capture('/classification', '08_classification.png');
+  await capture('/report', '09_report.png');
+  await capture('/system', '10_system.png');
+
+  await browser.close();
+  console.log('All screenshots captured!');
+})();