fix(ai): delete I2V temp file on combined Orch/worker

[ad-astra-video]

What does this pull request do? Explain your changes. (required)

Delete temp file when using combined orchestrator/ai-worker.

Specific updates (required)

• add defer os.Remove(image.Url) to saveLocalAIWorkerResults function when reading local file.

How did you test each of these updates (required)

Ran ai tests and tested locally

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• [x ] make runs successfully
• [x ] All tests in ./test.sh pass ai tests pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 35.78815%. Comparing base (1a45880) to head (2d11acc).
Report is 3 commits behind head on ai-video.

Files with missing lines	Patch %	Lines
core/ai_worker.go	0.00000%	2 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##            ai-video       #3234         +/-   ##
===================================================
- Coverage   35.79019%   35.78815%   -0.00204%     
===================================================
  Files            125         125                 
  Lines          35099       35101          +2     
===================================================
  Hits           12562       12562                 
- Misses         21831       21833          +2     
  Partials         706         706                 

Files with missing lines	Coverage Δ
core/ai_worker.go	32.08020% <0.00000%> (-0.08060%)	⬇️

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Files with missing lines	Coverage Δ
core/ai_worker.go	32.08020% <0.00000%> (-0.08060%)	⬇️