fix: resolve HF Spaces deployment timeout

fix(huggingface): update metadata with valid colorTo value

docs: add Testing & CI/CD section to README

docs: complete end-to-end documentation overhaul for frontend, backend, and project root

docs: add monitoring checklist and license note

docs(readme): update branding and add application preview image

refactor: update project branding and remove BAIF references

feat(ui): restyle frontend to match baif.org.in visual identity

deploy: add Hugging Face YAML metadata header to root README.md

docs: create comprehensive root README and update frontend guide