feat: recover 미들웨어 추가 (패닉 시 스택트레이스 출력)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/server/server.go

@@ -12,6 +12,7 @@ import (
 	"github.com/gofiber/fiber/v2/middleware/cors"
 	"github.com/gofiber/fiber/v2/middleware/limiter"
 	"github.com/gofiber/fiber/v2/middleware/logger"
+	"github.com/gofiber/fiber/v2/middleware/recover"
 	"github.com/redis/go-redis/v9"
 	"gorm.io/gorm"
 )
@@ -23,6 +24,9 @@ func New() *fiber.App {
 		BodyLimit:         4 * 1024 * 1024 * 1024, // 4GB
 		ErrorHandler:      middleware.ErrorHandler,
 	})
+	app.Use(recover.New(recover.Config{
+		EnableStackTrace: true,
+	}))
 	app.Use(middleware.RequestID)
 	app.Use(middleware.Metrics)
 	app.Get("/metrics", metrics.Handler)