refactor: refactor server as a package

backend/src/utils.py

@@ -0,0 +1,14 @@
+import json
+
+from stream import Stream
+from tool import ToolSpec
+
+def encode_json(value):
+    def encode_unknown(value):
+        if isinstance(value, ToolSpec):
+            return value.to_openai_dict()
+        elif isinstance(value, Stream):
+            return {'streamId': value.id}
+        else:
+            return repr(value)
+    return json.dumps(value, default=encode_unknown)