fixed requirements

oa_server.py

@@ -4,7 +4,6 @@ import json, time, uuid, logging
 from typing import Any, Dict, List, AsyncIterable, Optional
 
 from rabbit_repo import RabbitRepo
-from openai_backend import OpenAICompatChatBackend, OpenAIImagesBackend
 
 logger = logging.getLogger(__name__)
 
@@ -32,12 +31,13 @@ class OpenAIServers:
       - 'oaImagesGenerate'   -> handle_images_generate
     Uses RabbitRepo.publish(...) to emit CloudEvent-wrapped OpenAI JSON.
     """
+
     def __init__(self, publisher: RabbitRepo,
-                 *, chat_backend: Optional[ChatBackend] = None,
-                    images_backend: Optional[ImagesBackend] = None):
+                 *, chat_backend=None, images_backend=None):
         self._pub = publisher
-        self._chat = chat_backend or OpenAICompatChatBackend()
-        self._img  = images_backend or OpenAIImagesBackend()
+        self._chat = chat_backend
+        self._img  = images_backend
+
 
     # -------- Chat Completions --------
     async def handle_chat_create(self, data: Dict[str, Any]) -> None:

requirements.txt

@@ -1,7 +1,10 @@
 gradio==5.42.0
-fastapi==0.116.1
-uvicorn==0.35.0
+fastapi==0.115.5        # latest stable FastAPI
+uvicorn==0.30.6         # modern uvicorn, compatible
 aio-pika==9.5.7
-pydantic==2.11.1
-pydantic-settings==2.10.1
-spaces
+pydantic==2.10.5
+pydantic-settings==2.3.4
+spaces                  # HF Spaces decorator
+vllm>=0.6.3             # local LLM runner
+torch>=2.5.0            # GPU-enabled if space has CUDA
+transformers>=4.44.0    # to support HF safetensors + trust_remote_code