Refactor code structure and optimize performance across multiple modules

devops/offline/fixtures/notifier/templates/deprecation/tmpl-api-deprecation.email.en-us.template.json

@@ -0,0 +1,16 @@
+{
+  "schemaVersion": "notify.template@1",
+  "templateId": "tmpl-api-deprecation-email-en-us",
+  "tenantId": "bootstrap",
+  "channelType": "email",
+  "key": "tmpl-api-deprecation",
+  "locale": "en-us",
+  "renderMode": "html",
+  "format": "email",
+  "description": "Email notification for retiring Notifier API versions.",
+  "body": "<h2>Notifier API deprecation notice</h2>\n<p>The Notifier API v1 endpoints are scheduled for sunset on <strong>{{metadata.sunset}}</strong>.</p>\n<ul>\n  <li>Paths affected: {{metadata.paths}}</li>\n  <li>Scope: notify.*</li>\n  <li>Replacement: {{metadata.replacement}}</li>\n</ul>\n<p>Action: {{metadata.action}}</p>\n<p>Details: <a href=\"{{metadata.docs}}\">Deprecation bulletin</a></p>\n",
+  "metadata": {
+    "author": "notifications-bootstrap",
+    "version": "2025-11-17"
+  }
+}

devops/offline/fixtures/notifier/templates/deprecation/tmpl-api-deprecation.slack.en-us.template.json

@@ -0,0 +1,16 @@
+{
+  "schemaVersion": "notify.template@1",
+  "templateId": "tmpl-api-deprecation-slack-en-us",
+  "tenantId": "bootstrap",
+  "channelType": "slack",
+  "key": "tmpl-api-deprecation",
+  "locale": "en-us",
+  "renderMode": "markdown",
+  "format": "slack",
+  "description": "Slack notice for retiring Notifier API versions.",
+  "body": ":warning: Notifier API v1 is being deprecated.\nSunset: {{metadata.sunset}}\nPaths affected: {{metadata.paths}}\nDocs: {{link \"Deprecation details\" metadata.docs}}\nAction: {{metadata.action}}\n",
+  "metadata": {
+    "author": "notifications-bootstrap",
+    "version": "2025-11-17"
+  }
+}