Add Flux bootstrap and Gotify notifications

- Added SOPS-encrypted Gotify API token
- Created Gotify notification provider for Flux alerts
- Added bootstrap Kustomization for notifications
- Updated .sops.yaml to handle bootstrap directory
- Configured alerts for all GitRepository, Kustomization, and HelmRelease events

clusters/production/bootstrap.yaml

@@ -0,0 +1,18 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: bootstrap
+  namespace: flux-system
+spec:
+  interval: 10m
+  timeout: 5m
+  sourceRef:
+    kind: GitRepository
+    name: homelab
+  path: ./bootstrap
+  prune: true
+  wait: true
+  decryption:
+    provider: sops
+    secretRef:
+      name: sops-age