feat: SEO and Webmaster Tracking Integration

[OsakaLOOP]

Integrated search engine optimization by injecting localized content and generated LD+JSON schema via a Vite build plugin. Configured comprehensive event tracking across key user interactions for webmaster platforms (Google, Baidu, Bing). Added build-time sitemap generation for Tencent EdgeOne deployment.

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PR created automatically by Jules for task 3736597443655493201 started by @OsakaLOOP

[google-labs-jules]

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