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

bootstrap/notification-provider.yaml

@@ -0,0 +1,29 @@
+apiVersion: notification.toolkit.fluxcd.io/v1beta3
+kind: Provider
+metadata:
+  name: gotify
+  namespace: flux-system
+spec:
+  type: gotify
+  address: http://gotify.gotify.svc.cluster.local
+  secretRef:
+    name: gotify-token
+---
+apiVersion: notification.toolkit.fluxcd.io/v1beta3
+kind: Alert
+metadata:
+  name: homelab-alerts
+  namespace: flux-system
+spec:
+  providerRef:
+    name: gotify
+  eventSeverity: info
+  eventSources:
+    - kind: GitRepository
+      name: '*'
+    - kind: Kustomization
+      name: '*'
+    - kind: HelmRelease
+      name: '*'
+    - kind: HelmRepository
+      name: '*'