feat: Add local barcode plugin

compose.yml

@@ -83,6 +83,8 @@ services:
         volumes:
             # Data volume must map to /home/inventree/data
             - ${INVENTREE_EXT_VOLUME}:/home/inventree/data:z
+            - ./plugins.txt:/home/inventree/data/plugins.txt:ro,z
+            - ./plugins:/home/inventree/plugins:ro,z
         restart: unless-stopped
 
     # Background worker process handles long-running or periodic tasks