fix: restore requirements.txt-based install in Dockerfile

Copy requirements.txt before pip install so all dependencies resolve
together in one transaction. Pin gradio>=4.44.1 and huggingface-hub
to avoid HfFolder import errors while keeping compatible versions.

Co-Authored-By: Claude Opus 4.7 noreply@anthropic.com

Dockerfile

@@ -16,9 +16,9 @@ RUN apt-get update && apt-get install -y \
 
 RUN pip install --no-cache-dir pip -U
 
-RUN pip install --no-cache-dir \
-    torch>=2.0.0 \
-    gradio==3.50.0
+COPY requirements.txt /app/requirements.txt
+
+RUN pip install --no-cache-dir -r /app/requirements.txt
 
 COPY . /app
 

requirements.txt

@@ -1 +1,3 @@
 torch>=2.0.0
+gradio>=4.44.1
+huggingface-hub>=0.30,<1.0.0