The delete handler now sets the channel value to nil instead of removing
the map key, and the sanitization loop preserves nil/empty channel entries
as 'disabled' markers. This prevents SanitizeOAuthModelAlias from
re-injecting default kiro aliases after a user explicitly deletes them
through the management API.
Kiro models are exposed with kiro- prefix (e.g., kiro-claude-sonnet-4-5),
which prevents clients like Claude Code from using standard model names
(e.g., claude-sonnet-4-20250514).
This change injects default oauth-model-alias entries for the kiro channel
when no user-configured aliases exist, following the same pattern as the
existing Antigravity defaults. The aliases map standard Claude model names
(both with and without date suffixes) to their kiro-prefixed counterparts.
Default aliases added:
- claude-sonnet-4-5-20250929 / claude-sonnet-4-5 → kiro-claude-sonnet-4-5
- claude-sonnet-4-20250514 / claude-sonnet-4 → kiro-claude-sonnet-4
- claude-opus-4-6 → kiro-claude-opus-4-6
- claude-opus-4-5-20251101 / claude-opus-4-5 → kiro-claude-opus-4-5
- claude-haiku-4-5-20251001 / claude-haiku-4-5 → kiro-claude-haiku-4-5
All aliases use fork: true to preserve the original kiro-* names.
User-configured kiro aliases are respected and not overridden.
Closesrouter-for-me/CLIProxyAPIPlus#208
