fix(providers): make Nebius & Requesty keyless (no API key needed)

ci: add provider health-check workflow to catch broken fetchers

feat(providers): add OVHcloud, STACKIT, Nscale; fix Mistral & Nebius fetchers

fix(ci): restore fetch-depth: 0 for HF Space push

fix(ci): restore fetch-depth: 0 for HF Space push

fix(ci): remove git pull --rebase that breaks after commit

fix(ci): remove git pull --rebase that breaks after commit

ci: fix HF authentication in workflows by embedding token in remote URL

ci: move HF metadata to separate file and inject during sync

ci: make benchmark and provider update workflows more robust with rebase before push

ci: add GitHub Actions workflows for daily provider and weekly benchmark data refresh