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/status.py

@@ -159,14 +159,21 @@ def show_status(args):
     print(color("◆ Auth Providers", Colors.CYAN, Colors.BOLD))
 
     try:
-        from hermes_cli.auth import get_nous_auth_status, get_codex_auth_status, get_qwen_auth_status
+        from hermes_cli.auth import (
+            get_nous_auth_status,
+            get_codex_auth_status,
+            get_qwen_auth_status,
+            get_minimax_oauth_auth_status,
+        )
         nous_status = get_nous_auth_status()
         codex_status = get_codex_auth_status()
         qwen_status = get_qwen_auth_status()
+        minimax_status = get_minimax_oauth_auth_status()
     except Exception:
         nous_status = {}
         codex_status = {}
         qwen_status = {}
+        minimax_status = {}
 
     nous_logged_in = bool(nous_status.get("logged_in"))
     nous_error = nous_status.get("error")
@@ -219,6 +226,20 @@ def show_status(args):
     if qwen_status.get("error") and not qwen_logged_in:
         print(f"    Error:      {qwen_status.get('error')}")
 
+    minimax_logged_in = bool(minimax_status.get("logged_in"))
+    print(
+        f"  {'MiniMax OAuth':<12}  {check_mark(minimax_logged_in)} "
+        f"{'logged in' if minimax_logged_in else 'not logged in (run: hermes auth add minimax-oauth)'}"
+    )
+    minimax_region = minimax_status.get("region")
+    if minimax_logged_in and minimax_region:
+        print(f"    Region:     {minimax_region}")
+    minimax_exp = minimax_status.get("expires_at")
+    if minimax_exp:
+        print(f"    Access exp: {minimax_exp}")
+    if minimax_status.get("error") and not minimax_logged_in:
+        print(f"    Error:      {minimax_status.get('error')}")
+
     # =========================================================================
     # Nous Subscription Features
     # =========================================================================