fix(draft): reuse the study-backed project when drafts have duplicate rows

[vcnainala]

Summary

• Resolve the draft project that already has studies instead of Project::where('draft_id')->first(), which could pick an empty sibling from retries or concurrent process requests.
• Reassign existing studies (and their samples/datasets) onto the project used by the current process run, and return JSON 422 instead of a redirect when no studies exist.
• Score validation against the requested project (or the associated project with studies). A second commit makes associated-article DOI optional at publish time while still requiring at least one citation in project mode.

Laravel 13 notes: constructor-injected ProcessDraft on UploadController, explicit Response|JsonResponse return types, named process(project:) argument, and HasMany projects() alongside the existing hasOne project(). This app does not use Filament.

Test plan

• Process a draft that has an empty extra project row and confirm the UI keeps the project that already has studies.
• Publish that draft and confirm validation reports those studies.
• Process a draft with no instrument files and confirm a JSON 422 (no Inertia redirect).
• Publish a project-mode dataset whose citation has no DOI and confirm validation still passes if a citation exists.
• php artisan test --filter='ProcessDraftProjectReuseTest|ProjectValidationTest|UploadTest|ValidationModelTest|PublishProjectTest|PublishEmbargoProjectValidationTest'

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.50%. Comparing base (8681915) to head (9f516c1).

Files with missing lines	Patch %	Lines
app/Actions/Draft/FindOrCreateDraftStudy.php	50.00%	4 Missing ⚠️
app/Actions/Draft/ProcessDraft.php	92.59%	2 Missing ⚠️
app/Http/Controllers/DraftController.php	77.77%	2 Missing ⚠️
app/Http/Controllers/ProjectController.php	80.00%	1 Missing ⚠️
app/Jobs/ValidateAndSubmitELNDraft.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #1544      +/-   ##
=================================================
+ Coverage          80.26%   80.50%   +0.24%     
- Complexity          4481     4488       +7     
=================================================
  Files                293      293              
  Lines              16424    16473      +49     
=================================================
+ Hits               13182    13261      +79     
+ Misses              3242     3212      -30     

Flag	Coverage Δ
unittests	80.50% <88.88%> (+0.24%)	⬆️

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