feat: add external notification templates management

- Introduced NotificationTemplate model for reusable external notification templates.
- Implemented CRUD operations for external templates in NotificationService.
- Added routes for managing external templates in the API.
- Created frontend API methods for external templates.
- Enhanced Notifications page to manage external templates with a form and list view.
- Updated layout and login pages to improve UI consistency.
- Added integration tests for proxy host management with improved error handling.

data/caddy/data/certificates/local/test2.localhost/test2.localhost.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIBxzCCAW2gAwIBAgIQLEy0I3NtCyk+vKrWiqWa9TAKBggqhkjOPQQDAjAwMS4w
+LAYDVQQDEyVDYWRkeSBMb2NhbCBBdXRob3JpdHkgLSAyMDI1IEVDQyBSb290MB4X
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+TG9jYWwgQXV0aG9yaXR5IC0gRUNDIEludGVybWVkaWF0ZTBZMBMGByqGSM49AgEG
+CCqGSM49AwEHA0IABBzP8BZUlO8uEk7c09Sl3I68CS+AC60w+l+DIKuaqhi+sCJM
+ksM3MFZ6SfGs8rURi6MZqqkRfJqsF6ma/ko/oiyjZjBkMA4GA1UdDwEB/wQEAwIB
+BjASBgNVHRMBAf8ECDAGAQH/AgEAMB0GA1UdDgQWBBTIYQ24JwqfetB05clZWv1C
+yrJLlDAfBgNVHSMEGDAWgBREcndLnTskIjkt5DalMgkrk+/+iDAKBggqhkjOPQQD
+AgNIADBFAiAZ1KKvFsJGdbCSbTpEl5CQQrPf7PQzYN7w9AFpcGl3iQIhAKMy7uy8
+Hr0w5vrl/1R9FcrvNZKsDwquCBVr/BKAAIsk
+-----END CERTIFICATE-----

data/caddy/data/certificates/local/test2.localhost/test2.localhost.json

@@ -0,0 +1,6 @@
+{
+	"sans": [
+		"test2.localhost"
+	],
+	"issuer_data": null
+}

data/caddy/data/certificates/local/test2.localhost/test2.localhost.key

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIHuTybGDaH2llLl0Ye/IRlcL7UEluaswZWqFHo7A4WZyoAoGCCqGSM49
+AwEHoUQDQgAEVutAqanieVOMQ4EtKrXcaMSJjAbX4AUHS/OLYWVLtmlG5/z8DbJ6
+ZaNcyuk911ED7OqDKeL09wMtB4ZGSSPLtw==
+-----END EC PRIVATE KEY-----

data/caddy/data/last_clean.json

@@ -0,0 +1 @@
+{"tls":{"timestamp":"2025-11-29T18:19:07.702634586Z","instance_id":"2acc9ef3-fc3e-40f5-9462-d6682722eb94"}}

data/caddy/data/pki/authorities/local/intermediate.crt

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----
+MIIBxzCCAW2gAwIBAgIQLEy0I3NtCyk+vKrWiqWa9TAKBggqhkjOPQQDAjAwMS4w
+LAYDVQQDEyVDYWRkeSBMb2NhbCBBdXRob3JpdHkgLSAyMDI1IEVDQyBSb290MB4X
+DTI1MTEyOTE4MjU0N1oXDTI1MTIwNjE4MjU0N1owMzExMC8GA1UEAxMoQ2FkZHkg
+TG9jYWwgQXV0aG9yaXR5IC0gRUNDIEludGVybWVkaWF0ZTBZMBMGByqGSM49AgEG
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+BjASBgNVHRMBAf8ECDAGAQH/AgEAMB0GA1UdDgQWBBTIYQ24JwqfetB05clZWv1C
+yrJLlDAfBgNVHSMEGDAWgBREcndLnTskIjkt5DalMgkrk+/+iDAKBggqhkjOPQQD
+AgNIADBFAiAZ1KKvFsJGdbCSbTpEl5CQQrPf7PQzYN7w9AFpcGl3iQIhAKMy7uy8
+Hr0w5vrl/1R9FcrvNZKsDwquCBVr/BKAAIsk
+-----END CERTIFICATE-----

data/caddy/data/pki/authorities/local/intermediate.key

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIK62nlQXS+XmU6lLY1dkxanQW+5C+hDMRkAyMeLVPDrioAoGCCqGSM49
+AwEHoUQDQgAEHM/wFlSU7y4STtzT1KXcjrwJL4ALrTD6X4Mgq5qqGL6wIkySwzcw
+VnpJ8azytRGLoxmqqRF8mqwXqZr+Sj+iLA==
+-----END EC PRIVATE KEY-----

data/caddy/data/pki/authorities/local/root.crt

@@ -0,0 +1,11 @@
+-----BEGIN CERTIFICATE-----
+MIIBojCCAUmgAwIBAgIQFfTjqoMpNZnTSWKmX53qCzAKBggqhkjOPQQDAjAwMS4w
+LAYDVQQDEyVDYWRkeSBMb2NhbCBBdXRob3JpdHkgLSAyMDI1IEVDQyBSb290MB4X
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+TG9jYWwgQXV0aG9yaXR5IC0gMjAyNSBFQ0MgUm9vdDBZMBMGByqGSM49AgEGCCqG
+SM49AwEHA0IABPSnVwHAJdl5JJN8JT2K0VxGmtXMx1qMeQIq3bG891mR/Fa889/k
+PS8lb/txO1kDbkS46ZJZn1+iWRYGroHM9iejRTBDMA4GA1UdDwEB/wQEAwIBBjAS
+BgNVHRMBAf8ECDAGAQH/AgEBMB0GA1UdDgQWBBREcndLnTskIjkt5DalMgkrk+/+
+iDAKBggqhkjOPQQDAgNHADBEAiBcfxd1wNE1WakMLWMYU2kGCUTyB/S9MD0vlYtL
+AmTaUQIgJQ4Og2/PSGhG0UYGpICBI/dhxVkm7HQGKDiTaUNDHcE=
+-----END CERTIFICATE-----

data/caddy/data/pki/authorities/local/root.key

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIE4Z8xnl0mswc0hJile7xtFbVWhqcvgYS8ofcOY9rhJhoAoGCCqGSM49
+AwEHoUQDQgAE9KdXAcAl2Xkkk3wlPYrRXEaa1czHWox5Airdsbz3WZH8Vrzz3+Q9
+LyVv+3E7WQNuRLjpklmfX6JZFgaugcz2Jw==
+-----END EC PRIVATE KEY-----