Add comment system with models, forms, and UI integration for lessons

courses/forms.py

@@ -0,0 +1,13 @@
+from django import forms
+
+
+class CommentForm(forms.Form):
+    content = forms.CharField(
+        label="",
+        widget=forms.Textarea(attrs={
+            "rows": 3,
+            "placeholder": "Écrire un commentaire…",
+        }),
+        max_length=5000,
+    )
+    parent = forms.IntegerField(required=False, widget=forms.HiddenInput())