feat: 完成组件化改造 - 支持作为可嵌入组件使用

- 创建 YysEditorEmbed.vue 嵌入式组件
- 实现 preview/edit 双模式
- 配置 Vite library mode 构建
- 生成 ES Module + UMD + CSS 构建产物
- 完善设计文档和使用文档
- 更新 plan.md 标记阶段 2 完成

构建产物:
- dist/yys-editor.es.js (155KB, gzip: 35KB)
- dist/yys-editor.umd.js (112KB, gzip: 31KB)
- dist/yys-editor.css (69KB, gzip: 33KB)

相关文档:
- docs/2design/ComponentArchitecture.md
- docs/3build/YysEditorEmbed.md
- docs/3build/EMBED_README.md
- docs/4test/BUILD_TEST_REPORT.md

package.json

@@ -1,11 +1,28 @@
 {
-  "name": "vue-project",
-  "version": "0.0.0",
-  "private": true,
+  "name": "yys-editor",
+  "version": "1.0.0",
+  "description": "阴阳师流程图编辑器 - 可嵌入式组件",
+  "author": "yys-editor team",
+  "license": "MIT",
   "type": "module",
+  "main": "./dist/yys-editor.umd.js",
+  "module": "./dist/yys-editor.es.js",
+  "types": "./dist/YysEditorEmbed.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/yys-editor.es.js",
+      "require": "./dist/yys-editor.umd.js",
+      "types": "./dist/YysEditorEmbed.d.ts"
+    },
+    "./style.css": "./dist/yys-editor.css"
+  },
+  "files": [
+    "dist"
+  ],
   "scripts": {
     "dev": "vite",
     "build": "vite build",
+    "build:lib": "vite build --config vite.config.lib.js",
     "preview": "vite preview",
     "test": "vitest --run",
     "test:watch": "vitest",
@@ -15,6 +32,14 @@
     "format": "prettier --write src/",
     "precommit": "npm test && npm run lint"
   },
+  "peerDependencies": {
+    "vue": "^3.3.0",
+    "element-plus": "^2.9.0",
+    "pinia": "^3.0.0",
+    "@logicflow/core": "^2.0.0",
+    "@logicflow/extension": "^2.0.0",
+    "@logicflow/vue-node-registry": "^1.0.0"
+  },
   "dependencies": {
     "@element-plus/icons-vue": "^2.3.1",
     "@logicflow/core": "^2.0.16",