feat(model-picker): group custom_providers by name into a single row per provider

The /model picker currently renders one row per ``custom_providers``
entry. When several entries share the same provider name (e.g. four
``ollama-cloud`` entries for ``qwen3-coder``, ``glm-5.1``, ``kimi-k2``,
``minimax-m2.7``), users see four separate "Ollama Cloud" rows in the
picker, which is confusing UX — there is only one Ollama Cloud
provider, so there should be one row containing four models.

This PR groups ``custom_providers`` entries that share the same provider
name into a single picker row while keeping entries with distinct names
as separate rows. So:

* Four entries named ``Ollama Cloud`` → one "Ollama Cloud" row with
  four models inside.
* One entry named ``Ollama Cloud`` and one named ``Moonshot`` → two
  separate rows, one model each.

Implementation
--------------
Replaces the single-pass loop in ``list_authenticated_providers()`` with
a two-pass approach:

1. First pass: build an ``OrderedDict`` keyed by ``custom_provider_slug(name)``,
   accumulating ``models`` per group while preserving discovery order.
2. Second pass: iterate the groups and append one result row per group,
   skipping any slug that already appeared in an earlier provider source
   (the existing ``seen_slugs`` guard).

Insertion order is preserved via ``OrderedDict``, so providers and
their models still appear in the order the user listed them in
``custom_providers``. No new dependencies.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hermes_cli/model_switch.py

@@ -1027,7 +1027,17 @@ def list_authenticated_providers(
             })
 
     # --- 4. Saved custom providers from config ---
+    # Each ``custom_providers`` entry represents one model under a named
+    # provider. Entries sharing the same provider name are grouped into a
+    # single picker row so that e.g. four Ollama Cloud entries
+    # (qwen3-coder, glm-5.1, kimi-k2, minimax-m2.7) appear as one
+    # "Ollama Cloud" row with four models inside instead of four
+    # duplicate "Ollama Cloud" rows. Entries with distinct provider names
+    # still produce separate rows (e.g. Ollama Cloud vs Moonshot).
     if custom_providers and isinstance(custom_providers, list):
+        from collections import OrderedDict
+
+        groups: "OrderedDict[str, dict]" = OrderedDict()
         for entry in custom_providers:
             if not isinstance(entry, dict):
                 continue
@@ -1043,23 +1053,28 @@ def list_authenticated_providers(
                 continue
 
             slug = custom_provider_slug(display_name)
+            if slug not in groups:
+                groups[slug] = {
+                    "name": display_name,
+                    "api_url": api_url,
+                    "models": [],
+                }
+            default_model = (entry.get("model") or "").strip()
+            if default_model and default_model not in groups[slug]["models"]:
+                groups[slug]["models"].append(default_model)
+
+        for slug, grp in groups.items():
             if slug in seen_slugs:
                 continue
-
-            models_list = []
-            default_model = (entry.get("model") or "").strip()
-            if default_model:
-                models_list.append(default_model)
-
             results.append({
                 "slug": slug,
-                "name": display_name,
+                "name": grp["name"],
                 "is_current": slug == current_provider,
                 "is_user_defined": True,
-                "models": models_list,
-                "total_models": len(models_list),
+                "models": grp["models"],
+                "total_models": len(grp["models"]),
                 "source": "user-config",
-                "api_url": api_url,
+                "api_url": grp["api_url"],
             })
             seen_slugs.add(slug)