fix: Update Docker configuration for persistent data storage

- Update docker-compose.yml to use latest image marcogll/ap-pos:latest
- Change from bind mount to named volume for better data persistence
- Add proper volumes section to ensure database survives container restarts
- Update README with corrected deployment instructions

This fixes the issue where imported JSON products were lost on container restart.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker-compose.yml

@@ -1,6 +1,8 @@
+version: '3.8'
+
 services:
   ap-pos:
-    image: marcogll/ap_pos:1.4.1
+    image: marcogll/ap-pos:latest
     container_name: ap-pos
     restart: unless-stopped
     ports:
@@ -10,7 +12,7 @@ services:
       SESSION_SECRET: ${SESSION_SECRET:-your-very-secret-key-change-it-in-production}
       DB_PATH: /app/data/ap-pos.db
     volumes:
-      - ./data:/app/data
+      - ap_pos_data:/app/data
     healthcheck:
       test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:3111/login.html"]
       interval: 30s
@@ -18,4 +20,6 @@ services:
       retries: 3
       start_period: 40s
 
-# volumes section no longer needed - using direct bind mount
+volumes:
+  ap_pos_data:
+    driver: local