feat: 支持会话内补传资料并保持绑定

apps/chat/forms.py

@@ -1,4 +1,7 @@
 from django import forms
+from pathlib import Path
+
+from apps.documents.forms import MultipleFileField, SUPPORTED_EXTENSIONS
 
 
 class ChatForm(forms.Form):
@@ -38,3 +41,23 @@ class ChatForm(forms.Form):
     def clean_document_ids(self):
         # View 与 Agent Core 都使用整型文档 ID，统一在表单层完成转换。
         return [int(document_id) for document_id in self.cleaned_data.get("document_ids", [])]
+
+
+class ConversationUploadForm(forms.Form):
+    # 会话右侧上传区只负责继续补传资料，不修改会话绑定关系。
+    files = MultipleFileField(label="补充文件或资料包", required=False)
+    file = forms.FileField(label="兼容单文件上传", required=False)
+
+    def clean(self):
+        cleaned_data = super().clean()
+        files = list(cleaned_data.get("files") or [])
+        file = cleaned_data.get("file")
+        if file:
+            files.append(file)
+        if not files:
+            raise forms.ValidationError("请至少上传一个文件或资料包。")
+        for uploaded_file in files:
+            if Path(uploaded_file.name).suffix.lower() not in SUPPORTED_EXTENSIONS:
+                raise forms.ValidationError("仅支持 .txt、.md、.pdf、.docx、.zip 和 .7z 文件")
+        cleaned_data["uploaded_files"] = files
+        return cleaned_data