remove router.compile dead code, fix http docs, add uint8array doc, f…

[cs01]

Summary

• Remove Router.compile() dead code — handle() never used this.compiledRegex; the method, its helper countGroups(), and the associated fields (compiled, compiledRegex, groupOffset, groupCount) were never read. Removed entirely.
• Fix ChadScript.serveEmbedded d.ts signature — was typed as (req: HttpRequest) but actually takes (path: string). Also added missing getEmbeddedFileAsUint8Array to the namespace declaration.
• Add c.bytes() to Context response table in http-server.md — it existed in code and d.ts but wasn't documented.
• Add bodyLen to HttpRequest/HttpResponse doc tables — required for binary-safe request reading and response construction; was missing from both tables.
• Document serveFile() and bytesResponse() — exported from chadscript/http but absent from docs and the stdlib index module table.
• Add Uint8Array stdlib page — used across fs, HTTP, embed, and crypto APIs but had no reference page.

Test plan

• npm test passes (all existing tests green)
• Router still works correctly — handle() logic unchanged, only dead fields/methods removed
• Docs build: cd docs && npm run dev renders Uint8Array page and updated http-server page correctly