docs: add pipeline viewer implementation plan
Detailed step-by-step implementation tasks: 1. Create Pipeline DTOs in Core 2. Add Pipeline Routes to ApiRoutes 3. Add Repository Methods 4. Implement Repository Methods 5. Create PipelineController 6. Add Missing Factory Methods 7. Create Client API Service 8. Create SqlQueryModal Component 9. Create PipelineScheduleSection Component 10. Create PipelineViewer Page 11. Register Services 12. Add Navigation Link
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