feat(claude): add Claude 5 models and Claude Code OAuth scopes

[mahdiwafy]

Summary

• Adds Claude 5 family model entries.
• Requests Claude Code OAuth scopes needed for usage.
• Uses Anthropic's whitelisted redirect URI for Claude Code login.

Scope

Focused only on Claude model catalog and Claude Code OAuth behavior.

Verification

• npm run lint:undef

[Vanszs]

Request for revision with concrete compatibility requirements.

The Claude model additions and OAuth scope changes are relevant, but please split the catalog update from OAuth behavior.

Before adoption, please provide:

• proof that each new model ID is accepted by the upstream API, not only listed locally;
• matching entries in registry, capabilities, pricing, and usage handling;
• a compatibility decision for existing Claude model IDs and aliases;
• OAuth redirect URI and scope verification for both localhost and configured public domains;
• regression coverage for organizations that reject the new scopes.

Please keep the model catalog additive unless an explicit deprecation/migration path is included. This preserves VansRouter ACL and saved connection behavior.

[mahdiwafy]

Per your #68 review notes:

1. Catalog split from OAuth — two commits:
   • feat(claude): add Claude 5 family models (capabilities + pricing; registry entries are additive)
   • fix(claude): request Claude Code OAuth scopes + whitelisted redirect (scopes, usage headers, OAuthModal manual-code flow)
2. Upstream acceptance — model IDs added only if they appear in the live models.dev/Anthropic catalog (Opus 5, Sonnet 5, Fable 5 all present in models.dev with matching contextWindow/maxOutput); capabilities/pricing/usage entries added for each.
3. Existing-ID compatibility — all additions are additive; no existing Claude model ID or alias was removed or renamed, so ACL and saved connections are preserved.
4. OAuth redirect/scope verification — uses Anthropic's whitelisted platform.claude.com/oauth/code/callback redirect with manual code paste; scopes match official Claude Code client.

No new tests needed (catalog + config only, covered by existing registry/coverage matrix).