Restore lahmahtor proxy upstreams and add /api/lahmahtor route

[kojibai]

Motivation

• The lahmahtor proxy was pointing at incorrect upstream hosts preventing /api/lahmahtor requests from reaching the intended backend.
• Requests to /api/lahmahtor were not being handled by any Vercel API route, so nothing loaded for those paths.

Description

• Updated upstream constants in api/proxy/lahmahtorProxy.mjs to use PRIMARY = "https://m.kai.ac" and BACKUP = "https://memory.kaiklok.com".
• Added a Vercel API route api/lahmahtor/[[...path]].js that builds the request URL and forwards requests to the proxy handler via handleLahmahtorProxy.
• Introduced a buildRequestUrl helper inside the new route to construct the proxied URL from the incoming request, and set config.runtime to nodejs for the route.

Testing

• No automated tests were executed for these changes.
• Manual validation was not recorded in automated test output.

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Codex Task

[vercel]

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Project	Deployment	Review	Updated (UTC)
phi-network-5aii	Ready	Preview, Comment	Jan 1, 2026 3:06pm