feat: Implement NotifyPanelComponent with unit tests and mock API service

- Added NotifyPanelComponent for managing notification channels and rules.
- Implemented reactive forms for channel and rule management.
- Created unit tests for NotifyPanelComponent to validate functionality.
- Developed MockNotifyApiService to simulate API interactions for testing.
- Added mock data for channels, rules, and deliveries to facilitate testing.
- Introduced RuntimeEventFactoryTests to ensure correct event creation with build ID.

src/StellaOps.Scanner.Storage/Mongo/MongoBootstrapper.cs

@@ -195,6 +195,16 @@ public sealed class MongoBootstrapper
                     .Ascending(x => x.Node)
                     .Ascending(x => x.When),
                 new CreateIndexOptions { Name = "runtime_event_tenant_node_when" }),
+            new(
+                Builders<RuntimeEventDocument>.IndexKeys
+                    .Ascending(x => x.ImageDigest)
+                    .Descending(x => x.When),
+                new CreateIndexOptions { Name = "runtime_event_imageDigest_when" }),
+            new(
+                Builders<RuntimeEventDocument>.IndexKeys
+                    .Ascending(x => x.BuildId)
+                    .Descending(x => x.When),
+                new CreateIndexOptions { Name = "runtime_event_buildId_when" }),
             new(
                 Builders<RuntimeEventDocument>.IndexKeys.Ascending(x => x.ExpiresAt),
                 new CreateIndexOptions