chore: rename pipeline/run to redaction job terminology

[martsokha]

Context

The pipeline and pipeline run handlers use ETL-era naming. These should be reframed as redaction jobs/runs to align with the platform's redaction focus.

Requirements

• Rename pipelines to jobs (or redaction-jobs) across handlers, request/response types, database models, and API paths
• Rename pipeline_runs to runs (or job-runs)
• Update OpenAPI docs and Scalar UI tags
• Consider API versioning implications (may need to keep old paths as aliases during migration)

References

• Server docs: ARCHITECTURE.md - API Surface