feat(公开内容): 添加临时留言功能，留言保留10分钟，显示用户名、内容、时间和来源IP

core/forms.py

@@ -9,7 +9,8 @@ from .models import (
     TodayPlan,
     SystemConfig,
     FamilyMember,
-    PublicContent
+    PublicContent,
+    TempMessage
 )
 
 class ReadingRecordForm(forms.ModelForm):
@@ -142,4 +143,21 @@ class TempUploadForm(forms.ModelForm):
 
     class Meta:
         model = PublicContent
-        fields = ['title', 'file']
+        fields = ['title', 'file']
+
+
+class TempMessageForm(forms.ModelForm):
+    """临时留言表单"""
+    class Meta:
+        model = TempMessage
+        fields = ['username', 'content']
+        widgets = {
+            'username': forms.TextInput(attrs={'class': 'form-control', 'maxlength': '20', 'placeholder': '用户名（可选，最多20字节）'}),
+            'content': forms.Textarea(attrs={'class': 'form-control', 'rows': 3, 'maxlength': '1000', 'placeholder': '说点什么...（最多1000字节）'}),
+        }
+
+    def clean_content(self):
+        content = self.cleaned_data.get('content', '')
+        if len(content.encode('utf-8')) > 1000:
+            raise forms.ValidationError("内容不能超过1000字节")
+        return content