🔧(core) install and activate waffle

Waffle has never been used in DOcs. it must be installed.
the waffle app and middleware must also be activated in django settings.

Signed-off-by: charles <[email protected]>

src/backend/impress/settings.py

@@ -331,6 +331,7 @@ class Base(Configuration):
         "django.contrib.messages.middleware.MessageMiddleware",
         "dockerflow.django.middleware.DockerflowMiddleware",
         "csp.middleware.CSPMiddleware",
+        "waffle.middleware.WaffleMiddleware",
     ]
 
     AUTHENTICATION_BACKENDS = [
@@ -352,6 +353,7 @@ class Base(Configuration):
         "parler",
         "treebeard",
         "easy_thumbnails",
+        "waffle",
         # Django
         "django.contrib.admin",
         "django.contrib.auth",

src/backend/pyproject.toml

@@ -42,6 +42,7 @@ dependencies = [
     "django<6.0.0",
     "django-treebeard<5.0.0",
     "djangorestframework==3.16.1",
+    "django-waffle==5.0.0",
     "drf_spectacular==0.29.0",
     "dockerflow==2026.1.26",
     "easy_thumbnails==2.10.1",