16 of 20 rust services had no PORT env var set; their main.rs calls
std::env::var('PORT').expect('PORT must be a valid u16') which panicked
on startup. This commit adds env.PORT matching the existing containerPort
for each service. Service ports: gateway=9100 users=9101 companies=9102
jobs=9103 job_seekers=9104 customers=9105 employees=9106 photographers=9107
tutors=9108 makeup_artists=9109 developers=9110 video_editors=9111
graphic_designers=9112 social_media_managers=9113 fitness_trainers=9114
catering_services=9115 payments=9116 ugc_content_creators=9117 leads=9118
Namespace is now managed by Argo's spec.destination.namespace (nxtgauge)
This stops the permanent OutOfSync noise from duplicate namespace definitions.
Adds Kustomize base+prod overlays for nxtgauge-frontend-solid,
nxtgauge-admin-solid, and nxtgauge-backend-rust (18 services).
ArgoCD Image Updater configured for auto-deploy on high-performance-latest tag.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>