feat: add Vue widget demo node and development support

- Add LoraManagerDemoNode to node mappings for Vue widget demonstration
- Update .gitignore to exclude Vue widget development artifacts (node_modules, .vite, dist)
- Implement automatic Vue widget build check in development mode with fallback handling
- Maintain pytest compatibility with proper import error handling

vue-widgets/vite.config.mts

@@ -0,0 +1,35 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import { resolve } from 'path'
+
+export default defineConfig({
+    plugins: [vue()],
+    resolve: {
+        alias: {
+            '@': resolve(__dirname, './src')
+        }
+    },
+    build: {
+        lib: {
+            entry: resolve(__dirname, './src/main.ts'),
+            formats: ['es'],
+            fileName: 'demo-widget'
+        },
+        rollupOptions: {
+            external: [
+                '../../../scripts/app.js'
+            ],
+            output: {
+                dir: '../web/comfyui/vue-widgets',
+                entryFileNames: 'demo-widget.js',
+                chunkFileNames: 'assets/[name]-[hash].js',
+                assetFileNames: 'assets/[name]-[hash][extname]'
+            }
+        },
+        sourcemap: true,
+        minify: false
+    },
+    define: {
+        'process.env.NODE_ENV': JSON.stringify('production')
+    }
+})