feat: add @embedpdf/cli with doc search and reader commands

[peterjarian]

Motivation

Agentic coding workflows need a reliable way to search project docs without depending on web fetch tool calls. This gives agents a CLI they can call directly to find the right doc page and get answers from the codebase documentation.

Changes

Adds a new @embedpdf/cli package with two commands:

• search-docs <query> -- semantic search over documentation via OpenAI embeddings
• doc [path] -- read raw doc content in the terminal

Also adds the server-side /api/search endpoint that powers it, and a script to generate embeddings from the doc MDX files.

[vercel]

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