feat: enable image support for DeepSeek V4 models

[grizmin]

DeepSeek V4 Pro and V4 Flash support image inputs via their OpenAI-compatible API, but the model definitions had supportsImages: false. This change flips it to true for both models, enabling users to attach images when using these models.

Related GitHub Issue

Closes: #964

Description

Test Procedure

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

Documentation Updates

Additional Notes

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Summary by CodeRabbit

• New Features

  • Enabled image support for the DeepSeek V4 Flash and V4 Pro models.

• Tests

  • Added coverage confirming image support is correctly reported for both DeepSeek models.

[coderabbitai]

📝 Walkthrough

Walkthrough

DeepSeek V4 Flash and V4 Pro now advertise image support through their capability metadata. Tests for the default Flash model and explicit Pro model verify the updated supportsImages value.

Changes

DeepSeek image capability

Layer / File(s)	Summary
Model capability and validation packages/types/src/providers/deepseek.ts, src/api/providers/__tests__/deepseek.spec.ts	DeepSeek V4 Flash and Pro now set supportsImages to true, with matching getModel assertions.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• Zoo-Code-Org/Zoo-Code#6: Updates overlapping DeepSeek V4 model metadata and handler tests.

Suggested reviewers: taltas

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and accurately summarizes the main change: enabling image support for DeepSeek V4 models.
Description check	✅ Passed	The PR description includes the required issue link and change summary, but the Test Procedure section is empty and should be filled in.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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