Add _record_dashboard_proxy_event, _settle_market_result,
_get_market_source_details, _market_request_id and
_extract_usage_from_sse_chunk to RotationHandler, and the market
settlement cluster to AutoselectHandler. These were defined only on
RequestHandler, so rotation/autoselect requests raised AttributeError
(crash on the dashboard event path, silently swallowed elsewhere),
dropping market settlement and streaming usage capture.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

The collapsed provider-list status chip only rendered gpus[0], so a
coderai client connecting with multiple GPUs displayed just the first.
Render one chip per reported GPU (name + per-GPU VRAM), falling back to
an aggregate VRAM chip when no per-GPU detail is sent. GPU names are
HTML-escaped.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>