refactor: remove unused middleware imports from router

Clean up internal/router/router.go by removing:
- echomiddleware import that was no longer referenced

This change reduces unused imports and improves code hygiene. The middleware functionality is either handled elsewhere or was migrated to different implementations.

internal/router/router.go

@@ -23,7 +23,6 @@ import (
 	"github.com/jackc/pgx/v5/pgtype"
 	echojwt "github.com/labstack/echo-jwt/v5"
 	"github.com/labstack/echo/v5"
-	echomiddleware "github.com/labstack/echo/v5/middleware"
 )
 
 // CustomValidator wraps the go-playground validator
@@ -183,12 +182,6 @@ func RegisterRoutes(cfg *Config) *handlers.Handler {
 	}
 	e.Validator = &CustomValidator{validator: v}
 
-	// Global middleware
-	e.Use(echomiddleware.RequestLogger())
-	e.Use(echomiddleware.Recover())
-	e.Use(echomiddleware.CORS())
-	e.Use(ratelimit.RequestTracingMiddleware(cfg.Cfg))
-
 	// Rate limiter
 	rateLimiterConfig := ratelimit.RateLimiterConfig{
 		Enabled:           cfg.Cfg.RateLimitEnabled,