feat(contact): Controller、Router 与 Wire 集成

- controller/contact_controller.go: 全部 17 个 REST API 端点处理器
- router.go: Contact 模块路由注册（JWT 中间件保护）
- provider.go: Wire Provider Set（DAO + Service + Controller）
- 更新全局 provider、wire.go、router.go 集成 Contact 模块

Made-with: Cursor

backend/go-service/router/router.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/echochat/backend/app/admin"
 	"github.com/echochat/backend/app/auth"
+	"github.com/echochat/backend/app/contact"
 	"github.com/echochat/backend/app/provider"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/pkg/middleware"
@@ -34,6 +35,7 @@ func Setup(engine *gin.Engine, app *provider.App) {
 	auth.RegisterRoutes(engine, app.AuthController, app.AdminAuthController, jwtAuth)
 	admin.RegisterRoutes(engine, app.UserManageController, jwtAuth)
 	wsApp.RegisterRoutes(engine, app.WSHandler)
+	contact.RegisterRoutes(engine, app.ContactController, jwtAuth)
 
 	// [未来] im.RegisterRoutes(engine, app.ImController, jwtAuth)
 	// [未来] meeting.RegisterRoutes(engine, app.MeetingController, jwtAuth)