Add: size & blur hash fields

backend/api/posts/serializers.py

@@ -160,7 +160,9 @@ class PostSerializer(serializers.ModelSerializer):
                 {
                     "type": i.file_type,
                     "mimetype": i.mimetype,
+                    "size": i.file.size,
                     "hash": i.hash_blake3,
+                    "blur_hash": i.blur_hash,
                 }
             )
         return data