Enable gin release mode outside dev

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/main.go

@@ -28,6 +28,10 @@ func main() {
 	}
 	gin.DefaultWriter = io.MultiWriter(os.Stdout, logFile)
 
+	if os.Getenv("DEV_MODE") != "true" {
+		gin.SetMode(gin.ReleaseMode)
+	}
+
 	r := gin.Default()
 
 	err = r.SetTrustedProxies([]string{"172.28.0.0/16"})

docker-compose.dev.yml

@@ -11,6 +11,7 @@ services:
             - SPOTIFY_REDIRECT_URI=https://localhost/api/spotify/callback
             - GQL_PLAYGROUND=true
             - GQL_INTROSPECTION=true
+            - DEV_MODE=true
     nginx:
         environment:
             - DEV_MODE=true