Fix Next.js standalone build for Amplify WEB_COMPUTE

- Set output to standalone in next.config.js
- Update build artifacts to use .next/standalone
- Copy static files to standalone directory
- Remove invalid serverActions config

terraform/main.tf

@@ -63,6 +63,8 @@ resource "aws_amplify_app" "filamenteka" {
   tags = {
     Name        = "Filamenteka"
     Environment = var.environment
+    # Disable GitHub App migration prompt
+    "amplify:github_app_migration" = "opted_out"
   }
 }