feat: add extensions

packages/extensions/README.md

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+# @leafer-draw/extensions
+
+轻量级 Leafer Draw 扩展包，一站式集成常用组件、图表、动画。
+
+## 安装
+
+```bash
+npm install @leafer-draw/extensions
+```
+
+## 快速开始
+
+```typescript
+import { Leafer } from 'leafer-draw'
+import { BarChart, Progress, fadeIn, Spinner } from '@leafer-draw/extensions'
+
+const leafer = new Leafer({ view: 'app' })
+
+// 组件
+new Progress({ x: 50, y: 50, width: 200, percent: 60 })
+
+// 图表
+new BarChart({
+  x: 50, y: 100,
+  data: [
+    { label: 'A', value: 100 },
+    { label: 'B', value: 200 },
+    { label: 'C', value: 150 }
+  ]
+})
+
+// 动画
+fadeIn(element, { duration: 500 })
+```
+
+## 组件
+
+| 组件 | 说明 |
+|------|------|
+| `Progress` | 进度条 |
+| `Badge` | 徽章 |
+| `Tag` | 标签 |
+| `Avatar` | 头像 |
+| `Spinner` | 加载动画 |
+| `Skeleton` | 骨架屏 |
+
+## 图表
+
+| 图表 | 说明 |
+|------|------|
+| `BarChart` | 柱状图 |
+| `LineChart` | 折线图 |
+| `PieChart` | 饼图 / 环形图 |
+
+## 动画
+
+| 函数 | 说明 |
+|------|------|
+| `fadeIn` / `fadeOut` | 淡入淡出 |
+| `zoomIn` | 缩放进入 |
+| `slideIn` | 滑入 (top/bottom/left/right) |
+| `pulse` | 脉冲 |
+| `shake` | 摇摆 |
+| `spin` | 旋转 |
+
+## 文件结构
+
+```
+extensions/
+└── src/
+    └── index.ts    # 约 250 行，单文件集成
+```

packages/extensions/package.json

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+{
+  "name": "@leafer-draw/extensions",
+  "version": "2.0.3",
+  "description": "Leafer Draw extensions - Custom shapes, charts, and animations",
+  "author": "Chao (Leafer) Wan",
+  "license": "MIT",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "files": ["src"],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/leaferjs/leafer-draw.git"
+  },
+  "homepage": "https://github.com/leaferjs/leafer-draw/tree/main/packages/extensions",
+  "keywords": [
+    "leafer-draw",
+    "leafer-ui",
+    "charts",
+    "graphs",
+    "animations",
+    "canvas"
+  ],
+  "peerDependencies": {
+    "@leafer-ui/draw": "^2.0.3"
+  }
+}