fix(cron): normalize repeat integer updates to dict format

[liuhao1024]

Summary

Fixes cron.jobs.update_job() to normalize raw integer repeat values from API PATCH requests into the internal dict format ({"times": n, "completed": count}). Previously, the API would forward raw integers directly to update_job(), causing mark_job_run() to crash with AttributeError: 'int' object has no attribute 'get'.

Root Cause

• create_job() stores repeat as a dict: {"times": n, "completed": 0}
• API PATCH /api/jobs/{job_id} accepts repeat as a raw integer (e.g., {"repeat": 2})
• update_job() in cron/jobs.py merged updates directly without special handling for repeat
• mark_job_run() assumed job["repeat"] is a dict and called .get("completed") on it
• After an API update, job["repeat"] became an integer, causing mark_job_run() to crash on next run

Fix

Add repeat normalization in update_job(), mirroring the existing schedule field handling:

• If repeat is an integer > 0, normalize to {"times": value, "completed": existing_count}
• If repeat is <= 0, normalize to None (matching create_job() behavior)
• Preserve existing completed count from job's current repeat state

Affected Files

• cron/jobs.py - Add repeat_changed flag and normalization logic in update_job()
• tests/gateway/test_api_server_jobs_update_repeat.py - Add regression coverage for update path

Regression Coverage

• test_update_job_repeat_normalizes_integer_to_dict() - Verifies integer→dict normalization and completed preservation
• test_update_job_repeat_negative_or_zero_is_rejected() - Verifies repeat <= 0 is normalized to None

Testing

# New regression tests pass
python -m pytest tests/gateway/test_api_server_jobs_update_repeat.py -xvs
# 2 passed

# Existing cron tests pass
bash scripts/run_tests.sh tests/cron/test_jobs.py
# 61 passed

# Existing API server tests pass
bash scripts/run_tests.sh tests/gateway/test_api_server_jobs.py
# 35 passed, 35 warnings

Closes #15582

[liuhao1024]

Closing inactive PR with no discussion. Opened 2026-04-25 with 0 comments. Will reopen if still relevant.