Enhance printer schema by adding optional code field and default ID generation

- Introduced a new optional field `code` in the printer schema for additional identification.
- Updated the `_id` field to use a default value generated by `generateId()` for improved uniqueness.
- Ensured schema maintains required fields and defaults for better data integrity.

src/database/schemas/production/printer.schema.js

@@ -19,7 +19,8 @@ const alertSchema = new Schema(
     type: { type: String, required: true }, // error, info, message
     message: { type: String, required: false },
     actions: [{ type: String, required: false, default: [] }],
-    _id: { type: String, required: true },
+    _id: { type: String, required: true, default: () => generateId()() },
+    code: { type: String, required: false },
     canDismiss: { type: Boolean, required: true, default: true },
   },
   { timestamps: true, _id: false }