fix(azure-ai): add max_tokens limit for DeepSeek V4 models

[prabhash-varma]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

• New model pricing
• Update existing pricing
• New model configuration
• Bug fix

Source Verification

https://api-docs.deepseek.com/quick_start/pricing/

Important

Please include a link to the official pricing page from the provider. Simple "I heard it from somewhere" or screenshot sources are not accepted.

Checklist

• I have validated the JSON using jq or an online validator
• I have verified that prices are in cents per token (not dollars)
• I have included the source link above
• I have signed the CLA (if first-time contributor)

Related Issue

Fixes # (issue)

[Copilot]

Pull request overview

This PR updates the Azure AI model configuration to explicitly cap max_tokens for the new DeepSeek V4 model entries, aligning request parameter validation with the provider’s documented limits.

Changes:

• Add a max_tokens maxValue of 384000 for DeepSeek-V4-Flash.
• Add a max_tokens maxValue of 384000 for DeepSeek-V4-Pro.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.