* fix: return plain 401 for MCP OAuth discovery and harden auth flow
- Return plain HTTP 401 with WWW-Authenticate header (no JSON-RPC body)
so Claude Desktop's MCP client can trigger OAuth discovery correctly
- Remove unused apiKey import from authorize route
- Remove stale codeChallengeMethod parameter from oauth-codes
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix: add Retry-After header to 429 rate limit response
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>