perf(backend+frontend): 列表API响应体积优化 3.1MB→145KB (↓95.4%)

- 后端: JPQL构造器投影排除LONGTEXT大字段(uploadedImages/videoReferenceImages)
- 后端: DTO层过滤非分镜图类型的base64内联resultUrl
- 前端: 列表缩略图从video改为img loading=lazy，消除172并发请求
- 前端: download函数增加resultUrl懒加载(详情接口兜底)
- 文档: 新增性能优化报告 docs/performance-optimization-report.md

frontend/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "aigc-demo-frontend",
+  "version": "1.0.0",
+  "description": "AIGC Demo Frontend with Vue.js",
+  "main": "index.js",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "serve": "vite preview"
+  },
+  "dependencies": {
+    "@element-plus/icons-vue": "^2.1.0",
+    "axios": "^1.5.0",
+    "element-plus": "^2.3.8",
+    "pinia": "^2.1.6",
+    "qrcode": "^1.5.3",
+    "vue": "^3.3.4",
+    "vue-i18n": "^9.8.0",
+    "vue-router": "^4.2.4"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^4.3.4",
+    "sass": "^1.66.1",
+    "terser": "^5.44.1",
+    "vite": "^4.4.9"
+  },
+  "keywords": [
+    "vue",
+    "frontend",
+    "aigc"
+  ],
+  "author": "",
+  "license": "MIT"
+}