fix(argocd): repoURL http://forgejo.riotpiao.com:3000 -> https://forgejo.riotpiao.com

Root cause of widespread 'Unknown' sync status / Skipping auto-sync across
almost every Application: CoreDNS rewrites forgejo.riotpiao.com to the nginx
ingress controller service (rewrite name forgejo.riotpiao.com -> ingress-nginx-
controller...), which only listens on 80/443, not 3000. Every git fetch from
argocd-repo-server to the :3000 repoURL was timing out (context deadline
exceeded), so ArgoCD couldn't compare desired vs live state for any app.

Fix: use https://forgejo.riotpiao.com (no port, TLS via nginx + wildcard cert)
consistent with the 'all external endpoints HTTPS' requirement. Verified git
smart-http response 200 on the new URL before committing.

k8s/argocd/projects/homelab-project.yaml

@@ -11,7 +11,7 @@ metadata:
 spec:
   description: Homelab GitOps — single-repo, in-cluster destinations only
   sourceRepos:
-    - http://forgejo.riotpiao.com:3000/riotpiao.com/homelab.git
+    - https://forgejo.riotpiao.com/riotpiao.com/homelab.git
     # Public Helm chart repos referenced by k8s/argocd/apps/* and bootstrap/*
     - https://cloudnative-pg.github.io/charts
     - https://dl.gitea.com/charts/