fix(gui): connecter la GUI V6 au portail prod (P0-2, plus localhost)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/test_gui_v6_portal_url.py

@@ -0,0 +1,14 @@
+import pytest
+
+
+def test_default_portal_url_is_prod(monkeypatch):
+    monkeypatch.delenv("ANON_PORTAL_URL", raising=False)
+    from gui_v6.app import DEFAULT_PORTAL_URL, resolve_portal_url
+    assert DEFAULT_PORTAL_URL == "https://app.aivanov.eu"
+    assert resolve_portal_url() == "https://app.aivanov.eu"
+
+
+def test_portal_url_env_override(monkeypatch):
+    monkeypatch.setenv("ANON_PORTAL_URL", "http://localhost:8088")
+    from gui_v6.app import resolve_portal_url
+    assert resolve_portal_url() == "http://localhost:8088"