[miniflare/wrangler] Revert AI Search RPC workaround

[penalosa]

Reverts the workaround introduced in #12543 (commit 5a868a0c0).

That PR worked around capnweb classifying the raw AI binding's workerd-internal prototype as "unsupported", causing "RPC stub points at a non-serializable type", by threading a MF-Binding-Type: ai query param through the proxy stack and wrapping the binding in a plain object exposing only the aiSearch method.

This removes that workaround now that it's been fixed properly upstream.

Changes:

• Remove bindingType param from remoteProxyClientWorker() and the "ai" callsite in the AI plugin
• Remove bindingType / MF-Binding-Type from RemoteBindingEnv and ProxyMetadata
• Remove MF-Binding-Type passthrough in remote-proxy-client.worker.ts
• Remove AI_RPC_METHODS constant and wrapping block from ProxyServerWorker.ts
• Delete proxy-server-ai-rpc.test.ts

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: this is a pure revert of a workaround
• Public documentation
  • Documentation not necessary because: internal implementation detail

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🦋 Changeset detected

Latest commit: bad5f07

The changes in this PR will be included in the next version bump.

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commit: bad5f07

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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