Add phase 3: comments and cooking mode

- Comments on visible recipes; author and admin may delete; per-user
  hourly rate limit (COMMENT_RATE_LIMIT_PER_HOUR)
- Cooking mode with large text, tick-off checklists, serving scaling and
  Screen Wake Lock to keep the display on
- Serving calculator auto-submits on change
- Privacy tests cover comment and cooking-mode URLs

Co-Authored-By: Claude Opus 5.5 <[email protected]>

recipes/forms.py

@@ -3,7 +3,7 @@ from django.conf import settings
 from django.db import transaction
 
 from . import images, parsing
-from .models import Recipe
+from .models import Comment, Recipe
 
 
 class MultipleFileInput(forms.ClearableFileInput):
@@ -135,3 +135,11 @@ class SearchForm(forms.Form):
 
     def ingredient_terms(self):
         return [t.strip() for t in self.cleaned_data.get("zutat", "").split(",") if t.strip()]
+
+
+class CommentForm(forms.ModelForm):
+    class Meta:
+        model = Comment
+        fields = ["text"]
+        widgets = {"text": forms.Textarea(attrs={"rows": 3, "placeholder": "Hast du es nachgekocht? Tipps?", "maxlength": 2000})}
+        labels = {"text": "Kommentar schreiben"}