fix(gitea): set ROOT_URL to https://git.chemavx.xyz matching the actual ingress

The old ROOT_URL (gitea.chemavx.xyz) is not routed by traefik, so every
URL Gitea generated from it was broken — including webhook payload repo
URLs, which is why ArgoCD ignored real push events (host mismatch) and
deploys waited for the ~3min polling cycle. Applied live on 2026-06-12.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

gitea/statefulset-gitea.yaml

@@ -28,7 +28,7 @@ spec:
         - name: GITEA__server__DOMAIN
           value: gitea.chemavx.xyz
         - name: GITEA__server__ROOT_URL
-          value: https://gitea.chemavx.xyz
+          value: https://git.chemavx.xyz
         - name: GITEA__server__SSH_PORT
           value: '22'
         - name: GITEA__server__SSH_DOMAIN