feat(run-evaluation): Add optional duplication factor input

[kaapi-agent-bot]

Issue

Closes #268

Summary

• Adds an optional "Duplication Factor" input to RunEvaluationForm.
  • Shown once a dataset is selected, defaulting to that dataset's stored duplication_factor.
• The run-creation payload in app/(main)/evaluations/page.tsx includes duplication_factor only when the user's value differs from the dataset's stored value.
• Client-side validation rejects non-integer / less-than-1 values before submission, with a toast error.
• The override resets to the dataset's stored value when the selected dataset changes and clears after a successful run.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

Original PR description

Summary

• Adds an optional "Duplication Factor" input to RunEvaluationForm, shown once a dataset is selected and defaulting to that dataset's stored duplication_factor.
• The run-creation payload built in app/(main)/evaluations/page.tsx only includes duplication_factor when the user's value differs from the dataset's stored value, mirroring the existing run_mode pattern (only sent when non-default).
• Client-side validation rejects non-integer / less-than-1 values before submit, with a toast error, consistent with the other pre-submit checks in handleRunEvaluation.
• The override resets to the dataset's stored value whenever the selected dataset changes, and clears after a successful run.

Assumptions

• The backend "v2 run" endpoint referenced in the issue is the existing POST /api/v1/evaluations proxy (app/api/evaluations/route.ts) — there's no separate /v2 route in this repo, so I extended the existing run-creation payload with an optional duplication_factor: number field, following the same "send only when overridden" convention already used for run_mode.
• "Integer ≥ 1" validation is enforced client-side with a regex (/^[1-9]\d*$/) plus a toast error; no dedicated inline field-error UI was added since the rest of this form uses toast errors for this kind of client-side validation.

Closes #268

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