fix: use tektoncd/operator for proper K8s-native Tekton installation

ROOT CAUSE:
- Previous Application pointed to storage bucket (not valid ArgoCD source)
- ArgoCD couldn't sync manifests from non-git/non-helm source
- tektoncd/operator is the official way to install Tekton

SOLUTION:
- Switch to tektoncd/operator repository
- Use operator's config/install path (contains release manifests)
- Proper GitOps flow: ArgoCD watches operator repo → syncs manifests → K8s reconciles

BENEFITS:
✓ Official Tekton approach
✓ Proper K8s Operator pattern
✓ ArgoCD-compatible (git source)
✓ Automatic updates from upstream
✓ Full GitOps workflow

k8s/argocd/projects/homelab-project.yaml

@@ -45,8 +45,8 @@ spec:
     - https://stakater.github.io/stakater-charts
     # ArgoCD ecosystem charts
     - https://argoproj.github.io/argo-helm
-    # Tekton Pipelines (CNCF CI/CD)
-    - https://github.com/tektoncd/pipeline.git
+    # Tekton Pipelines (CNCF CI/CD) — uses tektoncd/operator
+    - https://github.com/tektoncd/operator.git
   destinations:
     - server: https://kubernetes.default.svc
       namespace: "*"