fix: correct stale documentation URLs in error mapper

[felixsanz]

Two doc paths in the error mapper (internal/api/transport/errors.go) 404 after the docs restructure:

• SDK/internal errors: getting-started/errors → platform/errors
• getResponse: platform/get-response → platform/task-polling

No tests assert these URLs, so this is a two-line constant change. Mirrors the same fix already shipped in the TypeScript and Python SDKs.

[coderabbitai]

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