Add three HTTP endpoints for OAuth login without terminal access:
- GET /oauth/authorize — generates PKCE params, redirects to
claude.com/cai/oauth/authorize with code=true and full scopes
- GET /callback — exchanges auth code for tokens via JSON POST to
platform.claude.com/v1/oauth/token, writes ~/.claude/.credentials.json
- GET /oauth/status — returns current credential state as JSON
Uses SHA-256 (sha2 crate) for PKCE code challenge. The authorize URL
targets claude.com/cai/ (not platform.claude.com) which is required
for Max/Pro subscriptions to grant user:inference scope.
Users visit http://localhost:3001/oauth/authorize in their browser
to authenticate. Matrix/WhatsApp can send this link when auth fails.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Timmy
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