Implement endpoint to retrieve model logs

[itallix]

Summary

• Streaming endpoint gets full log for jobs in terminal status
• Added a new endpoint to retrieve model logs

Checklist

• The PR title and description are clear and descriptive
• I have manually tested the changes
• All changes are covered by automated tests
• All related issues are linked to this PR (if applicable)
• Documentation has been updated (if applicable)

[Copilot]

Pull request overview

Adds support for retrieving model training logs via a new API endpoint and adjusts job log streaming behavior to allow streaming logs for terminal jobs.

Changes:

• Added GET /api/projects/{project_id}/models/{model_id}/logs endpoint backed by ModelService.get_logs().
• Updated job log streaming behavior and refactored streaming test helpers.
• Added unit/integration tests covering model-log retrieval and job-log streaming for completed jobs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
application/backend/app/services/model_service.py	Adds get_logs() to locate and validate availability of model training logs.
application/backend/app/api/routers/models.py	Introduces a new route returning log files via FileResponse.
application/backend/app/api/routers/jobs.py	Changes streaming logic so terminal jobs can still stream logs, but modifies stop conditions.
application/backend/tests/unit/routers/test_models.py	Adds unit tests for the new model logs endpoint.
application/backend/tests/unit/routers/test_jobs.py	Refactors streaming test helper and updates expectations for completed-job log streaming.
application/backend/tests/integration/services/test_model_service.py	Adds integration tests for ModelService.get_logs() across statuses and missing files.

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[github-actions]

📊 Test coverage report

Metric	Coverage
Lines	34.6%
Functions	73.8%
Branches	88.3%
Statements	34.6%

[github-actions]

Docker Image Sizes

CPU

Image	Size
geti-tune-cpu:pr-5469	2.97G
geti-tune-cpu:sha-9c163e4	2.97G

GPU

Image	Size
geti-tune-gpu:pr-5469	10.95G
geti-tune-gpu:sha-9c163e4	10.95G

XPU

Image	Size
geti-tune-xpu:pr-5469	9.76G
geti-tune-xpu:sha-9c163e4	9.76G