build: fix ALB routing for socket API paths via codegen domain

[field123]

Problem

Requests to https://codegen.integration.storefront.elasticpath.com/api/v1/socket/* were incorrectly routed to the codegen service instead of the
socket service due to ALB listener rule priorities.

Root Cause

• Codegen host-based rule (priority 110) had higher precedence than socket path-based rule (priority 150)
• Lower priority numbers have higher precedence in ALB routing

Solution

• Changed socket service listener rule priority from 150 to 108
• Ensures /api/v1/socket* paths route to socket service regardless of host header
• All existing security deny rules (140-142) remain effective

Testing

• Verified against live ALB configuration in integration environment
• No security implications - path-based routing is more specific and secure

Files Changed:

• terraform/services/socket-backend/main.tf - Updated listener rule priority

Deployment:
Auto-deploys on merge to master via existing CI/CD pipeline.