refactor(seller): 列表页抽离 useTable 重构与通用 UI 规范优化

- 抽离通用 useTable composable，并迁移 13 个典型列表页（采购/报损/订单/售后/统计/营销等）
- 增加表格与树组件全局空状态 (el-empty) 样式规范
- 补齐视图图片语义化 alt，并添加全局图片加载异常 SVG 占位兜底
- 替换遗留的 $Message 兼容语法为 ElMessage
- 将 WAP 店铺装修模板的 Options API 统一为 defineOptions
- 优化数据报表卡片视觉样式，并移除失效的品牌筛选选项
- 清理冗余依赖 vuex，将 sass-loader 调整至 devDependencies

seller/package.json

@@ -26,7 +26,6 @@
     "nprogress": "^0.2.0",
     "pinia": "^4.0.3",
     "sass": "^1.63.6",
-    "sass-loader": "^10.4.1",
     "swiper": "^6.3.5",
     "uuid": "^8.3.2",
     "vue": "^3.5.35",
@@ -39,7 +38,6 @@
     "@eslint/js": "^10.0.1",
     "@vue/cli-plugin-babel": "^5.0.9",
     "@vue/cli-plugin-router": "^5.0.9",
-    "@vue/cli-plugin-vuex": "^5.0.9",
     "@vue/cli-service": "^5.0.9",
     "@vue/compiler-sfc": "^3.5.35",
     "compression-webpack-plugin": "^10.0.0",
@@ -49,6 +47,7 @@
     "globals": "^17.13.0",
     "less": "^4.2.0",
     "less-loader": "^11.1.4",
+    "sass-loader": "^10.4.1",
     "style-loader": "^3.3.4",
     "style-resources-loader": "^1.5.0",
     "unplugin-vue-components": "0.27.5",