fix: address project audit gaps

backend/internal/httpx/router.go

@@ -7,7 +7,11 @@ import (
 	"senlinai-agent/backend/internal/config"
 )
 
-func NewRouter(cfg config.Config) *gin.Engine {
+type RouteRegistrar interface {
+	Register(router gin.IRouter)
+}
+
+func NewRouter(cfg config.Config, registrars ...RouteRegistrar) *gin.Engine {
 	if cfg.Env == "test" {
 		gin.SetMode(gin.TestMode)
 	}
@@ -18,6 +22,10 @@ func NewRouter(cfg config.Config) *gin.Engine {
 	router.GET("/healthz", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"status": "ok"})
 	})
+	api := router.Group("/api")
+	for _, registrar := range registrars {
+		registrar.Register(api)
+	}
 
 	return router
 }