[codex] Add standalone document renderer service

[MTG-Thomas]

Summary

Adds a standalone Bifrost document renderer service for PDF generation:

• exposes authenticated FastAPI endpoints for Markdown-to-PDF and HTML-to-PDF rendering
• wraps Pandoc and WeasyPrint behind a small service boundary
• includes three built-in CSS themes for report-style output
• adds a Dockerfile with the required renderer system dependencies
• adds unit coverage for auth, render success, invalid theme handling, and render failure propagation

Validation

• .venv/bin/pytest api/tests/unit/test_doc_renderer_service.py

Notes

Opened as draft because this platform service is intended to pair with the separate infra PR that provisions the adjacent Azure Container Apps path.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/doc-renderer-service

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud