Add unified jobs API with /api/jobs endpoints

[ric-yu]

Summary

• Add GET /api/jobs endpoint with filtering, sorting, and pagination
  • Filter by status: pending, in_progress, completed, error
  • Sort by create_time or execution_time
  • Pagination via limit/offset
• Add GET /api/jobs/{job_id} for single job details with full outputs
• Track execution_time in history for completed jobs
• Include outputs_count and preview_output in job responses
• Preview logic matches frontend (prefers type=output, supports images/video/audio/3D)

Motivation

Currently /queue and /history are separate endpoints with different response shapes. This unified API provides:

• Consistent job representation across all states
• Proper pagination and filtering
• Summary fields (outputs_count, preview_output) for list views without fetching full outputs

Test plan

• [x] Run existing tests: pytest tests/execution/test_execution.py -v
• [x] Verify /api/jobs returns jobs from queue and history on https://www.github.com/Comfy-Org/ComfyUI_frontend/commit/a57ea57a09a274efdc8444b949452509d7cf49de
• [x] Verify /api/jobs/{id} returns full job with outputs
• [x] Verify execution_time is tracked for completed jobs

[ric-yu]

Rebasing

[comfyanonymous]

Can you test this properly? The endpoint doesn't work after I run a regular workflow.

[ric-yu]

Can you test this properly? The endpoint doesn't work after I run a regular workflow.

Fixed an issue with preview as text. This endpoint has been working for me otherwise, but I'm stuck with testing light workflows since I'm on a Mac

[ric-yu]

rebasing