Remove legacy extra.map configuration

- Removed extra.map section that was causing duplicate installation paths
- Module will now install correctly to vendor/ directory only
- Magento's component registration handles module loading

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

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

composer.json

@@ -21,13 +21,5 @@
             "name": "Shopkeeper Dev",
             "email": "dev@example.com"
         }
-    ],
-    "extra": {
-        "map": [
-            [
-                "",
-                "app/code/Shopkeeper/VendorNotes"
     ]
-        ]
-    }
 }