feat/enhance the multi-modal support (#8818)

api/fields/raws.py

@@ -0,0 +1,17 @@
+from flask_restful import fields
+
+from core.file import File
+
+
+class FilesContainedField(fields.Raw):
+    def format(self, value):
+        return self._format_file_object(value)
+
+    def _format_file_object(self, v):
+        if isinstance(v, File):
+            return v.model_dump()
+        if isinstance(v, dict):
+            return {k: self._format_file_object(vv) for k, vv in v.items()}
+        if isinstance(v, list):
+            return [self._format_file_object(vv) for vv in v]
+        return v