Update serverless configuration to use exported stack output for Prisma Lambda Layer ARN, ensuring proper deployment functionality.

serverless.yml

@@ -20,7 +20,8 @@ provider:
   # Apply Prisma layer to all functions
   # Reference the layer defined in this stack using CloudFormation Ref
   layers:
-    - !Ref PrismaLambdaLayer
+    # Use the exported stack output so deploy function works (expects a string ARN)
+    - ${cf:${self:service}-${sls:stage}.PrismaLambdaLayerQualifiedArn}
   apiGateway:
     binaryMediaTypes:
       - '*/*'