fix(setup): validate base URL input in hermes model flow (#8264)

Reject non-URL values (e.g. shell commands typed by mistake) in the
base URL prompt during provider setup. Previously any string was saved
as-is to .env, breaking connectivity when the garbage value was used
as the API endpoint.

Adds http:// / https:// prefix check with a clear error message.
The custom-endpoint flow already had this validation (line 1620);
this brings the generic API-key provider flow to parity.

Triggered by a user support case where 'nano ~/.hermes/.env' was
accidentally entered as GLM_BASE_URL during Z.AI setup.

tests/hermes_cli/test_model_provider_persistence.py

@@ -257,3 +257,76 @@ class TestProviderPersistsAfterModelSave:
         assert model.get("provider") == "opencode-go"
         assert model.get("default") == "minimax-m2.5"
         assert model.get("api_mode") == "anthropic_messages"
+
+
+class TestBaseUrlValidation:
+    """Reject non-URL values in the base URL prompt (e.g. shell commands)."""
+
+    def test_invalid_base_url_rejected(self, config_home, monkeypatch, capsys):
+        """Typing a non-URL string should not be saved as the base URL."""
+        from hermes_cli.auth import PROVIDER_REGISTRY
+
+        pconfig = PROVIDER_REGISTRY.get("zai")
+        if not pconfig:
+            pytest.skip("zai not in PROVIDER_REGISTRY")
+
+        monkeypatch.setenv("GLM_API_KEY", "test-key")
+
+        from hermes_cli.main import _model_flow_api_key_provider
+        from hermes_cli.config import load_config, get_env_value
+
+        # User types a shell command instead of a URL at the base URL prompt
+        with patch("hermes_cli.auth._prompt_model_selection", return_value="glm-5"), \
+             patch("hermes_cli.auth.deactivate_provider"), \
+             patch("builtins.input", return_value="nano ~/.hermes/.env"):
+            _model_flow_api_key_provider(load_config(), "zai", "old-model")
+
+        # The garbage value should NOT have been saved
+        saved = get_env_value("GLM_BASE_URL") or ""
+        assert not saved or saved.startswith(("http://", "https://")), \
+            f"Non-URL value was saved as GLM_BASE_URL: {saved}"
+        captured = capsys.readouterr()
+        assert "Invalid URL" in captured.out
+
+    def test_valid_base_url_accepted(self, config_home, monkeypatch):
+        """A proper URL should be saved normally."""
+        from hermes_cli.auth import PROVIDER_REGISTRY
+
+        pconfig = PROVIDER_REGISTRY.get("zai")
+        if not pconfig:
+            pytest.skip("zai not in PROVIDER_REGISTRY")
+
+        monkeypatch.setenv("GLM_API_KEY", "test-key")
+
+        from hermes_cli.main import _model_flow_api_key_provider
+        from hermes_cli.config import load_config, get_env_value
+
+        with patch("hermes_cli.auth._prompt_model_selection", return_value="glm-5"), \
+             patch("hermes_cli.auth.deactivate_provider"), \
+             patch("builtins.input", return_value="https://custom.z.ai/api/paas/v4"):
+            _model_flow_api_key_provider(load_config(), "zai", "old-model")
+
+        saved = get_env_value("GLM_BASE_URL") or ""
+        assert saved == "https://custom.z.ai/api/paas/v4"
+
+    def test_empty_base_url_keeps_default(self, config_home, monkeypatch):
+        """Pressing Enter (empty) should not change the base URL."""
+        from hermes_cli.auth import PROVIDER_REGISTRY
+
+        pconfig = PROVIDER_REGISTRY.get("zai")
+        if not pconfig:
+            pytest.skip("zai not in PROVIDER_REGISTRY")
+
+        monkeypatch.setenv("GLM_API_KEY", "test-key")
+        monkeypatch.delenv("GLM_BASE_URL", raising=False)
+
+        from hermes_cli.main import _model_flow_api_key_provider
+        from hermes_cli.config import load_config, get_env_value
+
+        with patch("hermes_cli.auth._prompt_model_selection", return_value="glm-5"), \
+             patch("hermes_cli.auth.deactivate_provider"), \
+             patch("builtins.input", return_value=""):
+            _model_flow_api_key_provider(load_config(), "zai", "old-model")
+
+        saved = get_env_value("GLM_BASE_URL") or ""
+        assert saved == "", "Empty input should not save a base URL"