feat(web): 从 Notion 风格切换到 Pinterest 设计系统

- 替换 DESIGN.md 为 Pinterest 设计规格（暖色调、红色主题、大圆角）
- 更新 CSS 变量：主色 #0075de→#e60023, 圆角 4px→16px, 背景 #f6f5f4→#f6f6f3
- 更新 Ant Design 主题令牌：更大圆角、Pinterest 色板、更大触控目标
- 批量更新 24 个页面/组件文件中的硬编码颜色值
- 暗色模式同步适配 Pinterest 暖色调暗色方案

apps/web/src/pages/workflow/InstanceMonitor.tsx

@@ -13,10 +13,10 @@ import { getProcessDefinition, type NodeDef, type EdgeDef } from '../../api/work
 import ProcessViewer from './ProcessViewer';
 
 const statusStyles: Record<string, { bg: string; color: string; text: string }> = {
-  running: { bg: '#f2f9ff', color: '#0075de', text: '运行中' },
-  suspended: { bg: '#FFFBEB', color: '#dd5b00', text: '已挂起' },
-  completed: { bg: '#ECFDF5', color: '#1aae39', text: '已完成' },
-  terminated: { bg: '#FEF2F2', color: '#e5534b', text: '已终止' },
+  running: { bg: '#fef0f0', color: '#e60023', text: '运行中' },
+  suspended: { bg: '#FFFBEB', color: '#b56e1a', text: '已挂起' },
+  completed: { bg: '#ECFDF5', color: '#103c25', text: '已完成' },
+  terminated: { bg: '#FEF2F2', color: '#9e0a0a', text: '已终止' },
 };
 
 export default function InstanceMonitor() {
@@ -129,7 +129,7 @@ export default function InstanceMonitor() {
       key: 'status',
       width: 100,
       render: (s: string) => {
-        const info = statusStyles[s] || { bg: '#f6f5f4', color: '#615d59', text: s };
+        const info = statusStyles[s] || { bg: '#f6f6f3', color: '#62625b', text: s };
         return (
           <Tag style={{
             background: info.bg,
@@ -154,7 +154,7 @@ export default function InstanceMonitor() {
       key: 'started_at',
       width: 180,
       render: (v: string) => (
-        <span style={{ color: isDark ? '#615d59' : '#a39e98', fontSize: 13 }}>
+        <span style={{ color: isDark ? '#62625b' : '#91918c', fontSize: 13 }}>
           {new Date(v).toLocaleString()}
         </span>
       ),
@@ -214,7 +214,7 @@ export default function InstanceMonitor() {
       <div style={{
         background: isDark ? '#111827' : '#FFFFFF',
         borderRadius: 12,
-        border: `1px solid ${isDark ? '#1e1e1d' : '#f6f5f4'}`,
+        border: `1px solid ${isDark ? '#211922' : '#f6f6f3'}`,
         overflow: 'hidden',
       }}>
         <Table