hardening: deploy to existing hf space

ci: cover all frontend unit and render test files

cicd: remove stale chain ci tests

fix: Applying suggestions from Copilot manually

cicd: auto deployment hugging face space

dev: IntroduceSQLAlchemy + Alembic for DB versioning and ORM

dev: Postgres checkpoints and dev compose

ci:test: Backend Contract test into Github Actions

test: Let OpenAPI Lint replace a hard diff for compatibility

test: GitHub Actions pipeline updated, doc update

test: Github Actions CI and doc