document to markdown

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

docker-compose.yml

@@ -29,11 +29,17 @@
 services:
 
   # ── Backend (Express) ───────────────────────────────────────────────────────
+  # MarkItDown (PDF/PPTX -> Markdown sidecar for document import) lives in the
+  # separate chibistar/ stack, not here — extra_hosts lets this container
+  # reach its host-published port via host.docker.internal. Set
+  # MARKITDOWN_BASE_URL=http://host.docker.internal:8000 in .env for this to work.
   backend:
     build: .
     ports:
       - "3024:3024"
     env_file: .env
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     depends_on:
       postgres:
         condition: service_healthy