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feat(docs): `token_endpoint_auth_method` in OAuth server docs (#43128)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Docs update

## Summary
The OAuth server supports three token endpoint authentication methods
(`none`, `client_secret_basic`, `client_secret_post`), but the docs only
showed `client_secret_post` implicitly without labeling it, and never
mentioned client_secret_basic (the actual default for confidential
clients per RFC 7591).

- Add `token_endpoint_auth_method` explanation with defaults/constraints
to the client registration section in getting-started.mdx
- Update registration examples (JS, Python, cURL) and response JSON to
include token_endpoint_auth_method
- Restructure token exchange and refresh token sections in
oauth-flows.mdx to show all three auth methods with clear labels
- Add `client_secret_basic` examples using HTTP Basic auth header

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