feat(ai-gateway): prefer alibaba for DeepSeek V4 Pro and V4 Flash on OpenRouter

[kilo-code-bot]

Summary

• Adds isDeepseekV4Model helper to deepseek.ts that identifies deepseek/deepseek-v4-pro and deepseek/deepseek-v4-flash.
• Updates getPreferredProviderOrder in apply-provider-specific-logic.ts to route DeepSeek V4 Pro and V4 Flash through Alibaba first (order = 1), followed by DeepSeek and Novita as fallbacks — matching the same pattern used for Qwen models.
• Non-V4 DeepSeek models retain the existing [deepseek, novita] preference order.

Verification

• Test a request to deepseek/deepseek-v4-pro or deepseek/deepseek-v4-flash via the OpenRouter gateway and confirm the provider.order in the upstream request body begins with alibaba.

Visual Changes

N/A

Reviewer Notes

The isDeepseekV4Model check is placed before the broader isDeepseekModel check in getPreferredProviderOrder to ensure V4 models get the more specific routing. alibaba is already a valid entry in OpenRouterInferenceProviderIdSchema.

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Built for Ari Messer by Kilo for Slack

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Small, well-structured routing change that adds isDeepseekV4Model and places it correctly before the broader isDeepseekModel guard — alibaba is a valid OpenRouterInferenceProviderIdSchema enum entry and the fallback order mirrors the existing Qwen/Kimi pattern.

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/providers/deepseek.ts
• apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts

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[Copilot]

Pull request overview

This PR adjusts OpenRouter provider routing so that DeepSeek V4 Pro/Flash models prefer Alibaba as the first upstream inference provider, while keeping the existing provider preference order for other DeepSeek models.

Changes:

• Added an isDeepseekV4Model helper to identify DeepSeek V4 Pro/Flash model IDs.
• Updated getPreferredProviderOrder to route DeepSeek V4 Pro/Flash through [alibaba, deepseek, novita], while keeping non‑V4 DeepSeek as [deepseek, novita].

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
apps/web/src/lib/ai-gateway/providers/deepseek.ts	Adds a V4-specific model identification helper.
apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts	Uses the new helper to prefer Alibaba first for DeepSeek V4 provider routing.

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