fix: add imageUrl validation for img2video mode

[adhikjoshi]

Fixes the validation issue noted in review for PR #3288: ensures imageUrl is required when mode is img2video.

This validation was missing which could cause API errors when calling img2video without providing an imageUrl.

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[greptile-apps]

Greptile Summary

This PR adds essential validation to prevent API errors when using ModelsLab's img2video mode. The validation ensures that imageUrl is provided when the mode is set to 'img2video', which is required by the ModelsLab API.

• Added validation check at lines 981-983 in generateWithModelsLab function
• Throws clear error message when imageUrl is missing for img2video mode
• Validation occurs before making the API request, preventing unnecessary API calls

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change adds a simple, targeted validation that prevents API errors. The validation logic is correct and follows the same pattern used throughout the codebase. No complex logic or side effects introduced.
• No files require special attention

Important Files Changed

Filename	Overview
apps/sim/app/api/tools/video/route.ts	Added imageUrl validation for img2video mode in ModelsLab provider - prevents API errors

_{Last reviewed commit: 77b846b}

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