fix(artifact-store): defer init + use writable /tmp default for HF Spaces

Merge remote-tracking branch 'origin/main'

feat(saas-wrapper): P3-P11 production wrapper landing on HF

feat(bridge): add progress_workflow + prompt modules

fix(bridge): add missing artifact_routes + artifact_store modules

feat(bridge): ChatKit native workflow widget + artifacts endpoint + realtime progress feed (Phase 2 + M1) — app + tests

feat(bridge): ChatKit native workflow widget + artifacts endpoint + realtime progress feed (Phase 2 + M1)

fix(chatkit): upload route must return serialized Attachment, not {ok:true}

chore(chatkit): richer 400 diagnostic for upload field-shape debug

chore(chatkit): temp diagnostic /chatkit/debug/echo route

fix(chatkit): make upload multipart parser tolerant of field shape

fix(chatkit): accept multipart/form-data in upload route

feat(chatkit): add file upload support

chore: drop redundant x-openclaw-message-channel header

fix: override _load_full_thread to work around chatkit lib items-kwarg bug

debug: surface 500 traceback in response body

fix: return 404 for NotFoundError instead of 500

fix: exclude items from ThreadMetadata dump to avoid Thread() kwarg clash

fix: convert input.text to content parts for ChatKit CDN compat

debug: surface chatkit endpoint errors in response

Add Dockerfile, HF Space metadata, and GitHub Action sync

Initial commit: OpenClaw ChatKit bridge service