feat: refactor quest models

+ separate stage and exception
+ reuse commandResponder

packages/models/stage.js

@@ -0,0 +1,24 @@
+import { Schema } from 'mongoose'
+import commandResponderSchema from './commandResponder.js'
+import stageExceptionSchema from './stageException.js'
+import requirementSchema from './requirement.js'
+
+const stageSchema = new Schema({
+  id: {
+    type: String,
+    required: true,
+  },
+  task: {
+    type: String,
+    required: true,
+  },
+  exceptions: {
+    type: [stageExceptionSchema],
+    required: true,
+  },
+})
+
+stageSchema.add(commandResponderSchema)
+stageSchema.add(requirementSchema)
+
+export default stageSchema