自部署多端同步：服务端、实时协作、口令登录与油画加载动画

- 新增 Node 服务端（Hono + Hocuspocus + node:sqlite），数据保存在服务器
- 基于 Yjs 的多端实时同步，本机 IndexedDB 离线缓存，撤销只针对本机操作
- 空间（标签）有独立地址，增删改通过接口同步到所有设备
- 口令登录（签名 Cookie 会话、登录限流、同源校验）
- 图片上传到服务器，过大照片上传前自动压缩
- 历史版本（自动/手动保存、一键恢复）、跨空间搜索、在线设备
- 随机油画加载动画（Painting Loaders，本地收录 p5 / p5.brush）
- 选中样式与拖拽性能优化：拖动结束后才同步位置
- Docker / docker-compose 部署，README 与 CLAUDE.md 更新

package.json

@@ -4,9 +4,12 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "run-p dev:server dev:web",
+    "dev:web": "vite",
+    "dev:server": "node --experimental-strip-types --disable-warning=ExperimentalWarning --env-file-if-exists=.env --watch server/index.ts",
+    "start": "node --experimental-strip-types --disable-warning=ExperimentalWarning --env-file-if-exists=.env server/index.ts",
     "build": "run-p type-check \"build-only {@}\" --",
-    "preview": "vite preview",
+    "preview": "run-s build-only start",
     "test:unit": "vitest",
     "test:e2e": "playwright test",
     "build-only": "vite build",
@@ -17,6 +20,10 @@
     "format": "prettier --write --experimental-cli src/"
   },
   "dependencies": {
+    "@hocuspocus/extension-database": "4.7.1",
+    "@hocuspocus/provider": "4.7.1",
+    "@hocuspocus/server": "4.7.1",
+    "@hono/node-server": "2.1.5",
     "@lucide/vue": "^1.31.0",
     "@vue-flow/background": "^1.3.2",
     "@vue-flow/controls": "^1.1.3",
@@ -24,10 +31,13 @@
     "@vue-flow/minimap": "^1.5.4",
     "@vue-flow/node-resizer": "^1.5.1",
     "@vueuse/core": "^14.4.0",
-    "dexie": "^4.4.4",
+    "crossws": "0.4.15",
+    "hono": "4.13.13",
     "pinia": "^4.0.2",
     "vue": "^3.5.40",
-    "vue-router": "^5.2.0"
+    "vue-router": "^5.2.0",
+    "y-indexeddb": "9.0.12",
+    "yjs": "13.6.33"
   },
   "devDependencies": {
     "@playwright/test": "^1.61.1",