feat: NanoClaude Phase 1 — 비동기 job 기반 AI Gateway 코어 구현
POST /chat → job_id ACK, GET /chat/{job_id}/stream → SSE 스트리밍,
EXAONE Ollama adapter, JobManager, StateStream, Worker 구조
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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