feat(pipeline): ensure model dir tracked without weights; update swap pipeline changes

feat(webrtc): hybrid inline-if-idle processing, latency & queue metrics, pipeline stats endpoint

chore: remove deploy script; add persistent model storage & diagnostics

Init: succeed with landmark fallback; /debug/models shows generator.onnx; add models README

feat(docker): switch to Docker Space GPU runtime; prod WebRTC (aiortc) flow; remove legacy WS; token auth; instrumentation p50/p95; requirements harden

chore(gitignore): allow .gitkeep in models/ and checkpoints/ and add placeholders