feat: ai-sdk support for xai and deepseek

[uinstinct]

Description

add support for xai and deepseek providers

requires #10642 to be merged first

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Adds support for xAI and DeepSeek providers and upgrades adapters to Vercel AI SDK v6, aligning tool, message, and streaming formats for compatibility.

• New Features

  • Added xai and deepseek providers (createXai, createDeepSeek).
  • Switched Anthropics to native createAnthropic.

• Migration

  • Upgraded ai to v6; update dependencies accordingly.
  • Tools: parameters renamed to inputSchema; top-level schema must be type "object".
  • Tool calls: args renamed to input in messages and streams.
  • Streaming: text/reasoning now use start/delta/end with ids; file and source shapes updated.
  • max_tokens now passed as maxOutputTokens in AiSdkApi.

^{Written for commit ddbaab3. Summary will update on new commits.}

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