Serve OpenAI app verification challenge

[RhysSullivan]

Summary

• Add an edge middleware for /.well-known/openai-apps-challenge
• Return the OpenAI Apps verification token as text/plain before app-owned routing
• Cover the matcher and exact response bytes with a focused cloud test

Verification

• PATH=/Users/rhyssullivan/.bun/bin:$PATH bun run --cwd apps/cloud test src/edge/openai-apps-challenge.test.ts
• PATH=/Users/rhyssullivan/.bun/bin:$PATH bun run --cwd apps/cloud typecheck

Note: typecheck exits successfully and reports existing Effect suggestions/warnings in unrelated files.

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commit: 5977b43