perf(web): manualChunks 拆分 heavy deps + lazy ProcessDesigner/ProcessViewer

- vite.config.ts 添加 vendor-charts/plots/graphs, vendor-flow, vendor-editor 独立 chunk
- vendor-antd 从 3000kB 降至 1532kB，charts 独立 1459kB
- ProcessDesigner/ProcessViewer 改为 React.lazy 按需加载
- 移除 PluginGraphPage 遗留的 animFrameRef 未使用变量

apps/web/vite.config.ts

@@ -26,6 +26,15 @@ export default defineConfig({
           if (id.includes("node_modules/react-dom") || id.includes("node_modules/react/") || id.includes("node_modules/react-router-dom")) {
             return "vendor-react";
           }
+          if (id.includes("node_modules/@ant-design/charts") || id.includes("node_modules/@ant-design/plots") || id.includes("node_modules/@ant-design/graphs")) {
+            return "vendor-charts";
+          }
+          if (id.includes("node_modules/@xyflow/react")) {
+            return "vendor-flow";
+          }
+          if (id.includes("node_modules/@wangeditor/") || id.includes("node_modules/wangeditor/")) {
+            return "vendor-editor";
+          }
           if (id.includes("node_modules/antd") || id.includes("node_modules/@ant-design")) {
             return "vendor-antd";
           }