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/plugins/graph/graphConstants.ts

@@ -5,11 +5,11 @@
 
 // 通用边调色板
 const EDGE_PALETTE: Array<{ base: string; light: string; glow: string }> = [
-  { base: '#0075de', light: '#62aef0', glow: 'rgba(79,70,229,0.3)' },
-  { base: '#1aae39', light: '#34D399', glow: 'rgba(5,150,105,0.3)' },
-  { base: '#dd5b00', light: '#FBBF24', glow: 'rgba(217,119,6,0.3)' },
+  { base: '#e60023', light: '#f05a5a', glow: 'rgba(79,70,229,0.3)' },
+  { base: '#103c25', light: '#34D399', glow: 'rgba(5,150,105,0.3)' },
+  { base: '#b56e1a', light: '#FBBF24', glow: 'rgba(217,119,6,0.3)' },
   { base: '#0891B2', light: '#22D3EE', glow: 'rgba(8,145,178,0.3)' },
-  { base: '#e5534b', light: '#F87171', glow: 'rgba(220,38,38,0.3)' },
+  { base: '#9e0a0a', light: '#F87171', glow: 'rgba(220,38,38,0.3)' },
   { base: '#7C3AED', light: '#A78BFA', glow: 'rgba(124,58,237,0.3)' },
   { base: '#EA580C', light: '#FB923C', glow: 'rgba(234,88,12,0.3)' },
   { base: '#DB2777', light: '#F472B6', glow: 'rgba(219,39,119,0.3)' },

apps/web/src/pages/plugins/graph/graphRenderer.ts

@@ -295,8 +295,8 @@ export function drawFullGraph(
     const degree = degreeMap.get(node.id) || 0;
     const r = degreeToRadius(degree, isCenter);
 
-    let nodeColorBase = '#0075de';
-    let nodeColorLight = '#62aef0';
+    let nodeColorBase = '#e60023';
+    let nodeColorLight = '#f05a5a';
     let nodeColorGlow = 'rgba(79,70,229,0.3)';
 
     if (isCenter) {