fix(ci): resolve ruff lint errors, mypy type issues

feat(db): add tenants, users, candidates, audit, chat, insights tables

feat: add orchestrator, workflow runner, and service ports

feat(db): add revised-stack tables — queue, cache, rate-limit, checkpoints, ATS, fraud, bias

feat(models): add screening run and scoring tables

fix(models): declare the two pgvector/GIN indexes in ORM metadata

feat(rubric): add immutable rubric versioning with exact weight normalization

fix(db): declare content_tsv as TSVECTOR to match the migration

fix(db): resolve ResumeChunk vector type and declare is_parent column

feat(security): strip and score prompt injection on every ingest

feat: scaffold CV screener serving layer with ingestion pipeline, REST API routers, repositories, storage, parsing, security, and integration/unit test foundations

feat(api): add Phase 0-1 backend for identity and document ingestion