Change application port from 8080 to 9090

Update the Tomcat application port configuration to use port 9090 instead of 8080. This change affects:

- ECS task definition container port mappings
- Load balancer target group health checks
- Security group ingress rules
- ALB listener configurations

Author: jameslaneovermind

modules/scenarios/memory-optimization/variables.tf

@@ -100,7 +100,7 @@ variable "deregistration_delay" {
 variable "application_port" {
   description = "Port the Tomcat application listens on"
   type        = number
-  default     = 8080
+  default     = 9090
 }
 
 variable "cpu_units" {