Fix build: bump huggingface_hub to >=0.33.4 and upgrade pip in Dockerfile

Dockerfile

@@ -17,7 +17,8 @@ COPY . .
 ENV PYTHONPATH=/app
 
 # Install python dependencies
-RUN pip install --no-cache-dir -r requirements.txt
+RUN python -m pip install --upgrade pip setuptools wheel \
+ && pip install --no-cache-dir -r requirements.txt
 
 # Spaces sets $PORT; default locally to 8501
 ENV PORT=8501

requirements.txt

@@ -41,7 +41,8 @@ pandas==2.3.2
 numpy==1.26.4
 requests==2.32.5
 datasets==3.2.0
-huggingface_hub==0.26.2
+# langchain-huggingface>=0.3.1 requires huggingface-hub>=0.33.4
+huggingface_hub>=0.33.4
 
 # Optional semantic splitter (app gracefully falls back if missing)
 semantic-text-splitter==0.27.0