CC Uni Gate v0.1.7

Changes\n- Improve proxy log readability with stable key=value fields for human and machine parsing.\n- Add structured log fields for proxy phases, network policy, upstream status, error kinds, durations, and SSE failures.\n- Add a formatter test for quoted log values.\n\n## Verification\n- swift test\n- git diff --check\n- scripts/build-install-run.sh