fix: reponse format JSONSchema key fix (#427)

* fix: reponse format JSONSchema key fix

* fix

* update

---------

Co-authored-by: Aniket Maurya <theaniketmaurya@gmail.com>

Author: Lucaz0619

src/litserve/specs/openai.py

@@ -117,7 +117,7 @@ class ResponseFormatJSONObject(BaseModel):
 class JSONSchema(BaseModel):
     name: str
     description: Optional[str] = None
-    schema_def: Optional[Dict[str, object]] = Field(None, alias="schema")
+    schema_: Optional[Dict[str, object]] = Field(None, alias="schema")
     strict: Optional[bool] = False
 
 
@@ -405,7 +405,7 @@ async def streaming_completion(self, request: ChatCompletionRequest, pipe_respon
             usage_info = sum(usage_infos)
             chunk = ChatCompletionChunk(model=model, choices=choices, usage=None)
             logger.debug(chunk)
-            yield f"data: {chunk.model_dump_json()}\n\n"
+            yield f"data: {chunk.model_dump_json(by_alias=True)}\n\n"
 
         choices = [
             ChatCompletionStreamingChoice(
@@ -420,7 +420,7 @@ async def streaming_completion(self, request: ChatCompletionRequest, pipe_respon
             choices=choices,
             usage=usage_info,
         )
-        yield f"data: {last_chunk.model_dump_json()}\n\n"
+        yield f"data: {last_chunk.model_dump_json(by_alias=True)}\n\n"
         yield "data: [DONE]\n\n"
 
     async def non_streaming_completion(self, request: ChatCompletionRequest, generator_list: List[AsyncGenerator]):