feat(minimax-oauth): full integration with peer OAuth providers

Close integration gaps discovered by auditing qwen-oauth's file coverage.
These are surfaces the original salvage missed — they all existed on
main and were added in the 747 commits since PR #15203 was opened.

Coverage added:
- agent/credential_pool.py: seed pool from auth.json providers.minimax-oauth
  so `hermes auth list` reflects logged-in state and
  `hermes auth remove minimax-oauth <N>` works through the standard flow.
- agent/credential_sources.py: register RemovalStep for minimax-oauth
  with suppression-aware `_clear_auth_store_provider`.
- agent/models_dev.py: PROVIDER_TO_MODELS_DEV mapping (-> 'minimax' family).
- hermes_cli/providers.py: HermesOverlay entry (anthropic_messages transport,
  oauth_external auth_type, api.minimax.io/anthropic base).
- hermes_cli/model_normalize.py: add to _MATCHING_PREFIX_STRIP_PROVIDERS so
  `minimax-oauth/MiniMax-M2.7` in config.yaml gets correctly repaired.
- hermes_cli/status.py: render MiniMax OAuth block in `hermes doctor`
  (logged-in / region / expires_at / error).
- hermes_cli/web_server.py: register in OAUTH_PROVIDER_REGISTRY + dispatch
  branch in _resolve_provider_status so the dashboard auth page shows it.
- website/docs/integrations/providers.md: full 'MiniMax (OAuth)' section.
- website/docs/reference/cli-commands.md: --provider enum.
- website/docs/user-guide/features/fallback-providers.md: fallback table row.
- scripts/release.py AUTHOR_MAP: amanning3390 mapping (CI gate).

hermes_cli/web_server.py

@@ -1221,6 +1221,14 @@ _OAUTH_PROVIDER_CATALOG: tuple[Dict[str, Any], ...] = (
         "docs_url": "https://github.com/QwenLM/qwen-code",
         "status_fn": None,  # dispatched via auth.get_qwen_auth_status
     },
+    {
+        "id": "minimax-oauth",
+        "name": "MiniMax (OAuth)",
+        "flow": "pkce",
+        "cli_command": "hermes auth add minimax-oauth",
+        "docs_url": "https://www.minimax.io",
+        "status_fn": None,  # dispatched via auth.get_minimax_oauth_auth_status
+    },
 )
 
 
@@ -1264,6 +1272,16 @@ def _resolve_provider_status(provider_id: str, status_fn) -> Dict[str, Any]:
                 "expires_at": raw.get("expires_at"),
                 "has_refresh_token": bool(raw.get("has_refresh_token")),
             }
+        if provider_id == "minimax-oauth":
+            raw = hauth.get_minimax_oauth_auth_status()
+            return {
+                "logged_in": bool(raw.get("logged_in")),
+                "source": "minimax_oauth",
+                "source_label": f"MiniMax ({raw.get('region', 'global')})",
+                "token_preview": None,
+                "expires_at": raw.get("expires_at"),
+                "has_refresh_token": True,
+            }
     except Exception as e:
         return {"logged_in": False, "error": str(e)}
     return {"logged_in": False}