fix: add missing COPY static ./static to Dockerfile

Dockerfile

@@ -11,6 +11,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY main.py ./
 COPY src ./src
 COPY templates ./templates
+COPY static ./static
 COPY agent-guides ./agent-guides
 
 RUN mkdir -p /app/data /app/logs