Fix build issues and optimize Dockerfile

requirements.txt

@@ -1,5 +1,5 @@
-fastapi==0.115.12
-uvicorn==0.34.2
-pydantic==2.11.4
-llama-cpp-python==0.3.8
-huggingface_hub==0.30.2
+fastapi>=0.115.12
+uvicorn>=0.34.2
+pydantic>=2.11.4
+llama-cpp-python>=0.3.8
+huggingface_hub>=0.25.0