Add Kiro to the list of supported channels for OAuth model name mappings,
allowing users to map Kiro model IDs (e.g., kiro-claude-opus-4-5) to
canonical model names (e.g., claude-opus-4-5-20251101).
The Kiro case is implemented as a separate switch block to keep it
isolated from upstream CLIProxyAPI providers, making future merges
from the upstream repository cleaner.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>