feat(dc): Complete Phase 1 - Portal workbench page development

Summary:
- Implement DC module Portal page with 3 tool cards
- Create ToolCard component with decorative background and hover animations
- Implement TaskList component with table layout and progress bars
- Implement AssetLibrary component with tab switching and file cards
- Complete database verification (4 tables confirmed)
- Complete backend API verification (6 endpoints ready)
- Optimize UI to match prototype design (V2.html)

Frontend Components (~715 lines):
- components/ToolCard.tsx - Tool cards with animations
- components/TaskList.tsx - Recent tasks table view
- components/AssetLibrary.tsx - Data asset library with tabs
- hooks/useRecentTasks.ts - Task state management
- hooks/useAssets.ts - Asset state management
- pages/Portal.tsx - Main portal page
- types/portal.ts - TypeScript type definitions

Backend Verification:
- Backend API: 1495 lines code verified
- Database: dc_schema with 4 tables verified
- API endpoints: 6 endpoints tested (templates API works)

Documentation:
- Database verification report
- Backend API test report
- Phase 1 completion summary
- UI optimization report
- Development task checklist
- Development plan for Tool B

Status: Phase 1 completed (100%), ready for browser testing
Next: Phase 2 - Tool B Step 1 and 2 development

frontend-v2/src/modules/dc/components/ToolCard.tsx

@@ -0,0 +1,123 @@
+/**
+ * DC模块 - 工具卡片组件
+ * 
+ * 用于Portal页面的3个工具快速启动卡片
+ * 设计参考：智能数据清洗工作台V2.html
+ */
+
+import { useNavigate } from 'react-router-dom';
+import { 
+  FileSpreadsheet, 
+  Bot, 
+  Table2,
+  ArrowRight,
+  LucideIcon 
+} from 'lucide-react';
+import type { ToolCard as ToolCardType } from '../types/portal';
+
+interface ToolCardProps {
+  tool: ToolCardType;
+}
+
+const iconMap: Record<string, LucideIcon> = {
+  FileSpreadsheet,
+  Bot,
+  Table2
+};
+
+const colorMap = {
+  blue: {
+    bg: 'bg-blue-100',
+    icon: 'text-blue-600',
+    decorBg: 'bg-blue-50',
+    hoverText: 'group-hover:text-blue-600',
+    actionText: 'text-blue-600'
+  },
+  purple: {
+    bg: 'bg-purple-100',
+    icon: 'text-purple-600',
+    decorBg: 'bg-purple-50',
+    hoverText: 'group-hover:text-purple-600',
+    actionText: 'text-purple-600'
+  },
+  emerald: {
+    bg: 'bg-emerald-100',
+    icon: 'text-emerald-600',
+    decorBg: 'bg-emerald-50',
+    hoverText: 'group-hover:text-emerald-600',
+    actionText: 'text-emerald-600'
+  }
+};
+
+const ToolCard = ({ tool }: ToolCardProps) => {
+  const navigate = useNavigate();
+  const Icon = iconMap[tool.icon] || Bot;
+  const colors = colorMap[tool.color];
+  
+  const isDisabled = tool.status === 'disabled';
+
+  const handleClick = () => {
+    if (!isDisabled) {
+      navigate(tool.route);
+    }
+  };
+
+  return (
+    <div 
+      onClick={handleClick}
+      className={`
+        bg-white rounded-xl shadow-sm border border-slate-200 p-6 
+        transition-shadow group relative overflow-hidden
+        ${isDisabled ? 'opacity-60 cursor-not-allowed' : 'hover:shadow-md cursor-pointer'}
+      `}
+    >
+      {/* 装饰性圆形背景 */}
+      <div className={`
+        absolute top-0 right-0 w-24 h-24 rounded-bl-full -mr-4 -mt-4
+        transition-transform
+        ${colors.decorBg}
+        ${!isDisabled && 'group-hover:scale-110'}
+      `} />
+
+      <div className="relative">
+        {/* 图标 */}
+        <div className={`
+          w-12 h-12 ${colors.bg} rounded-lg 
+          flex items-center justify-center mb-4
+          ${colors.icon}
+        `}>
+          <Icon className="w-7 h-7" />
+        </div>
+
+        {/* 标题 */}
+        <h3 className={`
+          text-lg font-bold text-slate-900 mb-2 
+          transition-colors
+          ${!isDisabled && colors.hoverText}
+        `}>
+          {tool.title}
+        </h3>
+
+        {/* 描述 - 固定高度确保对齐 */}
+        <p className="text-sm text-slate-500 mb-4 h-10 leading-relaxed">
+          {tool.description}
+        </p>
+
+        {/* 行动按钮 */}
+        {isDisabled ? (
+          <div className="flex items-center text-sm font-medium text-slate-400">
+            <span>敬请期待</span>
+          </div>
+        ) : (
+          <div className={`flex items-center text-sm font-medium ${colors.actionText}`}>
+            <span>{tool.id === 'tool-a' ? '开始合并' : tool.id === 'tool-b' ? '新建提取任务' : '打开编辑器'}</span>
+            <ArrowRight className="w-4 h-4 ml-1 transition-transform group-hover:translate-x-1" />
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};
+
+export default ToolCard;
+