bind: MLflow port to 127.0.0.1:5000:5000 in docker-compose.yml

Changes:
- Updated docker-compose.yml MLflow service port binding from 5000:5000 to 127.0.0.1:5000:5000
  to restrict access to localhost only for security
- Marked task 1.7 as complete in tasks.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -52,7 +52,7 @@ services:
   mlflow:
     image: ghcr.io/mlflow/mlflow:v2.10.0
     ports:
-      - "5000:5000"
+      - "127.0.0.1:5000:5000"
     volumes:
       - mlflow-data:/mlflow
     command: >