When both enable_jwt_auth and enable_oauth2_auth are True, the proxy now
routes tokens based on their format:
- JWT tokens (3 dot-separated parts) -> JWT auth handler
- Opaque tokens -> OAuth2 auth handler
This enables using JWT for human users and OAuth2 for M2M (machine) clients
on the same LiteLLM instance. Previously, enabling OAuth2 would intercept
all tokens on LLM API routes before JWT auth could run.
When only one auth method is enabled, behavior is unchanged (backward compatible).
df2e1bca46