🤖 fix: handle null citations in Anthropic API proxy responses

[ibetitsmike]

Some AI bridge proxies (e.g., Coder's aibridge) normalize Anthropic API responses and incorrectly set citations: null on all content blocks. The Vercel AI SDK's Anthropic provider has strict validation that expects citations to be an array when present, causing validation errors like:

Invalid input: expected array, received null

This adds a fetch wrapper that intercepts responses and removes null citations fields from content blocks before the SDK validates them.

Error trace (before fix)

APICallError: Invalid JSON response
  cause: TypeValidationError: expected array, received null
    path: ["content", 0, "citations"]

Solution

Wrap the Anthropic provider's fetch to:

1. Intercept JSON responses
2. Remove citations: null from content blocks
3. Return the fixed response to the SDK

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