merge dev: dockerignore Rust artifacts, cost tracker, image compressor close

feat: per-request compression segments breakdown in /visualize

fix: route count_tokens to api.anthropic.com, not proxy base_url

Remove LLMLingua: Kompress is the sole text compressor

Fix CI: guard starlette imports, asyncio.run(), deprecate datetime.utcnow()

Fix flaky JavaScript signature preservation test threshold

Add universal compression module with ML-based content detection