refactor(auth): modularize auth plugin with physical subpackages and decoupled services

backend/plugins/domain/auth/model/dto/cap.go

@@ -0,0 +1,32 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package dto provides data transfer objects and views for the auth plugin.
+package dto
+
+import (
+	"Wavelet/plugins/domain/auth/pow"
+)
+
+// ChallengeResponse is a local type alias for the pow.ChallengeResponse struct
+type ChallengeResponse = pow.ChallengeResponse
+
+// ChallengeRequest is the CAPTCHA challenge request payload.
+type ChallengeRequest struct {
+	Scope string `json:"scope" form:"scope"`
+}
+
+// RedeemRequest is the CAPTCHA redeem request payload.
+type RedeemRequest struct {
+	Token     string `json:"token" binding:"required"`
+	Solutions []int  `json:"solutions" binding:"required"`
+	Scope     string `json:"scope" form:"scope"`
+}
+
+// RedeemResponse is returned to the client on redeem.
+type RedeemResponse struct {
+	Success bool   `json:"success"`
+	Token   string `json:"token,omitempty"`
+	Expires int64  `json:"expires,omitempty"`
+	Error   string `json:"error,omitempty"`
+}