fix: Include aes_iv in cache key and fix subdomain parsing for cloud mode

1. license.rb: Add aes_iv to Redis cache key to prevent CipherError after
   container restart. New random IVs after restart were causing stale cache
   decryption failures.

2. action_controller.rb:
   - Use request.subdomains.first instead of .last to correctly parse shop
     code from tenant.fc.smartsales.asia domains
   - Add localhost bypass (127.0.0.1 / ::1) for Docker health checks in
     cloud mode, returning 200 OK instead of 404 not_found

Refs: infra-fix-2026-05-06

app/models/license.rb

@@ -32,7 +32,7 @@ class License
     aes_key, aes_iv = aes.export_to_file(lookup)
 
     ##Check from local redis - if available load local otherwise get from remote
-    cache_key = "#{lookup}:license:#{aes_key}:hostname"
+    cache_key = "#{lookup}:license:#{aes_key}:#{aes_iv}:hostname"
 
     cache_license = nil