integrate-local-retry-relay

[SunwardL]

What changed

• Change the default dashboard port from 8787 to 8792.
• Integrate a local OpenAI-compatible retry relay.
• Retry transport errors, temporary HTTP failures, and pre-commit SSE disconnects.
• Add optional --buffer-until-success SSE buffering with a 64 MiB cap.
• Emit privacy-safe JSONL relay events consumed by the CURI dashboard.
• Add one-command startup with python curi.py serve --upstream ....

Validation

• python -m unittest -v
• python -m py_compile curi.py relay.py
• git diff --check