SDK part input id type does not enforce prt prefix

[StatPan]

Description

The server rejects part IDs that don't start with prt — but the SDK types id as string, so invalid IDs pass the type checker and only fail at runtime.

Steps to reproduce

1. Install @opencode-ai/sdk
2. Call the prompt API with a part containing id: "task_something"
3. Runtime error: Invalid string: must start with "prt"

Root cause

openapi.json already has "pattern": "^prt.*" on these id fields, but the generator doesn't translate that into a template-literal type.

[github-actions]

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