fix(auth): rewrite stale MiniMax OAuth approval URL

[LeonSGP43]

Summary

• rewrite stale MiniMax OAuth approval URLs from www.minimax.io/oauth-authorize to platform.minimax.io/oauth-authorize
• preserve the original path, query parameters, and unrelated verification URLs
• cover the rewrite and preservation behavior in the MiniMax OAuth tests

Why

Fixes #19337. The current MiniMax OAuth code trusts the portal response verification URL directly. Live checks show https://www.minimax.io/oauth-authorize?user_code=TEST&client=OpenClaw redirects away to the homepage with 307, while https://platform.minimax.io/oauth-authorize?user_code=TEST&client=OpenClaw returns 200.

Test

• scripts/run_tests.sh tests/test_minimax_oauth.py

[teknium1]

Thanks for the focused regression fix. I found no blocking correctness or completeness issue in this diff.

Current main still returns the MiniMax verification_uri unchanged from _minimax_request_user_code (hermes_cli/auth.py:7450), then prints and opens it in the CLI (hermes_cli/auth.py:7567-7575). The dashboard invokes that same helper (hermes_cli/web_server.py:8787) and exposes its raw verification_uri (hermes_cli/web_server.py:8834). The proposed shared-boundary normalization therefore covers both paths, while its tests cover the stale-host rewrite and unrelated URLs.

This is an automated hermes-sweeper review.