PDF publishing

Summary: This work establishes the Phase 1 foundation for PDF publishing, delivering the initial MVP across models, APIs, and infrastructure needed to support document generation and publishing workflows. The implementation was refined with clearer blob storage handling in PDF dispatch and expanded infrastructure support through dedicated containers for stylesheet configurations and publish jobs. Specification updates also clarified scope and deferred lower-priority styling capabilities to keep the initial delivery focused. Key Changes: - Delivered the initial PDF publishing MVP, including core models, APIs, and infrastructure components. - Added dedicated `PdfStylesheetConfigs` and `PdfPublishJobs` containers to support stylesheet management and job tracking. - Refactored PDF dispatch logic to use explicit blob storage parameters for clearer and more reliable storage integration. - Added and refined the PDF publishing feature specification, including scope clarification and removal of stylesheet file upload from Phase 1. - Resolved specification priority conflicts by deferring the no-code styling scenario to a later story. Impact: These changes provide the technical foundation for scalable PDF publishing while improving clarity in storage integration and operational job management. By tightening scope and deferring nonessential features, the team reduced delivery risk and accelerated readiness for future PDF publishing enhancements.