Use env vars for ports, add .env.TEST

- WIZARD_PORT, MYSQL_PORT, BACKEND_PORT, FRONTEND_PORT env vars
- .env.TEST with default values (8080, 3306, 8000, 3000)
- Scripts load .env.TEST automatically
- LISTEN_ADDR uses env vars
- Ports bound to 127.0.0.1 for security

.env.TEST

@@ -0,0 +1,14 @@
+# HarborForge Test Environment Variables
+# Default port values
+
+# Wizard service
+WIZARD_PORT=8080
+
+# MySQL service  
+MYSQL_PORT=3306
+
+# Backend service
+BACKEND_PORT=8000
+
+# Frontend service
+FRONTEND_PORT=3000