chore: bind ML service port to 127.0.0.1:8001:8001 for localhost-only access

- Changed ML service port binding from 8001:8001 to 127.0.0.1:8001:8001 in docker-compose.yml
- Marks task 1.8 as complete in tasks.md

docker-compose.yml

@@ -28,7 +28,7 @@ services:
   ml-service:
     build: ./services/ml
     ports:
-      - "8001:8001"
+      - "127.0.0.1:8001:8001"
     volumes:
       - ml-data:/app/data
       - mlflow-data:/app/mlruns