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

.sops.yaml

@@ -1,4 +1,9 @@
 creation_rules:
+  # Bootstrap secrets
+  - path_regex: bootstrap/.*\.yaml$
+    encrypted_regex: ^(data|stringData|password|token|apiKey|secret|key)$
+    age: age1c7ke5ajhtzua7lrvzsg2p7krnnqv5jhvafh4lsl2s022j46jggnss4rxry
+
   # Default rule for all encrypted files
   - path_regex: .*\.enc\.yaml$
     encrypted_regex: ^(data|stringData|password|token|apiKey|secret|key)$