A1: Replace per-repo Forgejo entries with https://forgejo.riotpiao.com/rock/*
wildcard so onboarding never requires touching AppProject.
A2: Add wave -1 Application for k8s/argocd/projects/ so it syncs before
any Application references the AppProject.
Also add kustomization.yaml to k8s/argocd/projects/ to make it renderable.
Enabled by Stage 1 (A1, A2).
