Fix Dockerfile user order

Dockerfile

@@ -15,11 +15,13 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Create a non-root user (Hugging Face Recommended)
+# Must create user BEFORE copying files so --chown works
+RUN useradd -m -u 1000 user
+
 # Copy source code and fix permissions
 COPY --chown=user:user . .
 
-# Create a non-root user (Hugging Face Recommended)
-RUN useradd -m -u 1000 user
 USER user
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH