feat(web): 引入 Vite 前端应用并扩展仓库忽略规则

将整套 web 源码纳入仓库，并为 web/node_modules、构建产物及本地环境文件配置 .gitignore，同时移除占位用的 assets/.gitkeep。

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/images/sider/foldCompanyLoago.svg

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+</svg>

web/src/images/sider/foldlogo.svg

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