[Feat] Add DeepSeek V4 Flash Vision Exp support

[zoomote]

​Opened on behalf of @taltas. Follow up by mentioning @roomote, in the web UI, or in Discord.

What changed

• Adds deepseek-v4-flash-vision-exp to the native DeepSeek catalog with vision, thinking, temperature, context/output limits, cache pricing, and prompt-cache metadata.
• Adds Fireworks' verified static entry, accounts/fireworks/models/deepseek-v4-flash-vision-exp, with provider-specific limits and pricing.
• Extends native DeepSeek request handling for thinking controls and reasoning-effort normalization while preserving image blocks in OpenAI-compatible requests.
• Adds focused coverage for metadata, model fetching, static selection, request behavior, and image input.

Why this change was made

DeepSeek released an experimental multimodal V4 Flash model that is now available through the native DeepSeek API and Fireworks. Static catalogs need explicit metadata so Zoo Code can select the model, retain image input, expose reasoning controls, and estimate cost correctly.

Authoritative sources:

• DeepSeek release announcement
• DeepSeek models and pricing
• DeepSeek vision guide
• DeepSeek thinking-mode guide
• Fireworks model page
• OpenRouter model page

Impact

Users can select the model through native DeepSeek and Fireworks with image support and accurate provider-specific metadata. Native peak rates are $0.44/M cache-miss input, $0.014/M cache-hit input, and $1.32/M output; DeepSeek's off-peak rates are half. Fireworks rates are $0.22/M input, $0.007/M cached input, and $0.66/M output.

OpenRouter already discovers this model dynamically, so no static entry was added. Other static provider catalogs were left unchanged because their providers do not currently expose a verified deployment and provider-specific ID. After merging current main, full lint and type checks pass, focused suites pass with 144 tests and 1 skipped, and the full Zoo Code suite passes with 8,006 tests and 39 skipped. The delegated visual-proof handoff timed out, so no screenshot evidence is included.

Related PRs

• Zoo-Code-Docs: [Docs] Document DeepSeek V4 Flash Vision Exp Zoo-Code-Docs#57

[github-actions]

Review status

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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