Add Gitea Actions CI, ArgoCD Application, and Gitea Packages wiring

- .gitea/workflows/ci.yml: build → seo:lint → e2e → image build/push →
  bump k8s image tag and commit back (paths-ignore + [skip ci] guard)
- argocd/bcs-website-application.yaml: ArgoCD App (internal Gitea repoURL, k8s path)
- k8s: image → Gitea Packages path; kustomization images newTag stanza
- ADR-0007 (Gitea Actions + Packages), supersedes GHCR/GitHub bits of ADR-0001
- Reconcile gitops-deployment-strategy.md to Gitea

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

k8s/kustomization.yaml

@@ -6,3 +6,8 @@ resources:
   - deployment.yaml
   - service.yaml
   - ingress.yaml
+
+# CI updates newTag to the immutable git-sha via `kustomize edit set image` (see .gitea/workflows/ci.yml).
+images:
+  - name: 10.66.15.22:3000/bmr_bluecap/bcs-website
+    newTag: latest