Cleanup: remove ARG CACHEBUST from Dockerfiles

Dockerfile

@@ -8,7 +8,6 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy frontend static files
-ARG CACHEBUST=4
 COPY index.html app.js services.css about.html contact.html ./ 
 # Copy backend
 COPY deepshell-backend/ ./deepshell-backend/

Dockerfile.hf

@@ -8,7 +8,6 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy frontend static files
-ARG CACHEBUST=4
 COPY index.html app.js services.css about.html contact.html ./ 
 # Copy backend
 COPY deepshell-backend/ ./deepshell-backend/