AiAssistant: new mode switch (AI助手/数字员工) in dialog header. Agent mode shows a product info form that triggers the agent pipeline (search->analyze->outreach). Pipeline progress stages and lead results displayed inline. i18n: added missing nav keys (home, more, productsQuotations) to both zh-CN and en locale files.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
- vue-i18n@9 with locale files for zh-CN and en
- Language switcher in topbar
- Navigation, breadcrumb, credits page translated
- Discovery page i18n keys prepared
- Language persisted in localStorage
- Build verified