build: include tools in image for server-side imports

Dockerfile

@@ -22,6 +22,7 @@ RUN pip install --no-cache-dir "httpx==0.28.1"
 COPY app.py favsort.py ./
 COPY reaction_board ./reaction_board
 COPY vendor ./vendor
+COPY tools ./tools
 
 VOLUME ["/config", "/data"]
 EXPOSE 8080