diff --git a/docs/changelog/index.md b/docs/changelog/index.md
index 4563dae9..02647859 100644
--- a/docs/changelog/index.md
+++ b/docs/changelog/index.md
@@ -26,6 +26,8 @@ sidebar: false
 
 - 前端页面鉴权改为默认私域：除 `/login`、`/register`、`/callback` 外，未登录访问任意页面（含数据看板 `/`）均重定向至登录页。
 
+- 重构优化：收敛 `flared` 和 `relay` 客户端模块中重复声明的 `APIResponse` 结构体，统一通过类型别名复用 `pkg/protocol.APIResponse`。
+
 ### 修复
 
 - 修复 Agent 升级版本比对逻辑：使用统一的 `pkg/utils.CompareVersions` 对比版本，正确处理预览/预发布版本（如 `v3.0.0-beta` 升级到 `v3.0.0-beta.1`），避免升级按钮非预期禁用的问题。
diff --git a/internal/apps/custom/routers.go b/internal/apps/custom/routers.go
deleted file mode 100644
index cb377fbe..00000000
--- a/internal/apps/custom/routers.go
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2026 Arctel.net
-// SPDX-License-Identifier: Apache-2.0
-
-// Package custom provides custom business handlers
-package custom
-
-import (
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-
-	"github.com/Rain-kl/Wavelet/internal/common/response"
-)
-
-// Hello is a sample handler for custom business logic
-// @Summary Sample Hello API
-// @Description A sample business API for customization
-// @Tags custom
-// @Produce json
-// @Success 200 {object} response.Any{data=string} "成功"
-// @Router /api/v1/custom/hello [get]
-func Hello(c *gin.Context) {
-	c.JSON(http.StatusOK, response.OK("Hello from custom business module!"))
-}
diff --git a/internal/apps/flared/httpclient/client.go b/internal/apps/flared/httpclient/client.go
index 9dd284a2..2426f21e 100644
--- a/internal/apps/flared/httpclient/client.go
+++ b/internal/apps/flared/httpclient/client.go
@@ -9,11 +9,8 @@ import (
 	service "github.com/Rain-kl/Wavelet/pkg/protocol"
 )
 
-// APIResponse is the standard JSON envelope returned by the Wavelet API.
-type APIResponse[T any] struct {
-	ErrorMsg string `json:"error_msg"`
-	Data     T      `json:"data"`
-}
+// APIResponse is an alias for service.APIResponse.
+type APIResponse[T any] = service.APIResponse[T]
 
 // Client is the HTTP client for the flared tunnel API.
 type Client struct {
diff --git a/internal/apps/relay/httpclient/client.go b/internal/apps/relay/httpclient/client.go
index 0d584be0..8176cc55 100644
--- a/internal/apps/relay/httpclient/client.go
+++ b/internal/apps/relay/httpclient/client.go
@@ -9,11 +9,8 @@ import (
 	service "github.com/Rain-kl/Wavelet/pkg/protocol"
 )
 
-// APIResponse wraps a control-plane API response with an optional error message.
-type APIResponse[T any] struct {
-	ErrorMsg string `json:"error_msg"`
-	Data     T      `json:"data"`
-}
+// APIResponse is an alias for service.APIResponse.
+type APIResponse[T any] = service.APIResponse[T]
 
 // Client sends authenticated requests to the relay control-plane API.
 type Client struct {
diff --git a/internal/router/v1/custom.go b/internal/router/v1/custom.go
index ba88641d..15b1942b 100644
--- a/internal/router/v1/custom.go
+++ b/internal/router/v1/custom.go
@@ -4,15 +4,7 @@
 // Package v1 contains router registrations for API V1
 package v1
 
-import (
-	"github.com/Rain-kl/Wavelet/internal/apps/custom"
-	"github.com/gin-gonic/gin"
-)
-
 // RegisterCustomRoutes registers custom business routes to keep routing clean and stable.
-func RegisterCustomRoutes(apiV1Router *gin.RouterGroup) {
-	customRouter := apiV1Router.Group("/custom")
-	{
-		customRouter.GET("/hello", custom.Hello)
-	}
+func RegisterCustomRoutes() {
+
 }
diff --git a/internal/router/v1/v1.go b/internal/router/v1/v1.go
index 8efd4183..33b0b51a 100644
--- a/internal/router/v1/v1.go
+++ b/internal/router/v1/v1.go
@@ -22,5 +22,5 @@ func RegisterV1Routes(apiV1Router *gin.RouterGroup, apiGroup *gin.RouterGroup) {
 	ofrouter.RegisterRoutes(apiV1Router)
 
 	// 4. Custom business routes (example only)
-	RegisterCustomRoutes(apiV1Router)
+	RegisterCustomRoutes()
 }