feat: llmcache nested layout

[domeccleston]

Switch to a URL scheme of /semantic-cache/[gatewayId]/[slug] for better organization

_{Huly®: ENG-1752}

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Latest commit: 138cabc445567651ccb26c5e9203e963e8a4132f

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[github-actions[bot]]

Thank you for following the naming conventions for pull request titles! 🙏