Add channel test providers for Email, Slack, Teams, and Webhook

- Implemented EmailChannelTestProvider to generate email preview payloads.
- Implemented SlackChannelTestProvider to create Slack message previews.
- Implemented TeamsChannelTestProvider for generating Teams Adaptive Card previews.
- Implemented WebhookChannelTestProvider to create webhook payloads.
- Added INotifyChannelTestProvider interface for channel-specific preview generation.
- Created ChannelTestPreviewContracts for request and response models.
- Developed NotifyChannelTestService to handle test send requests and generate previews.
- Added rate limit policies for test sends and delivery history.
- Implemented unit tests for service registration and binding.
- Updated project files to include necessary dependencies and configurations.

etc/authority.yaml.sample

@@ -52,7 +52,7 @@ bootstrap:
 # against the application content root, enabling air-gapped deployments
 # that package plug-ins alongside binaries.
 pluginDirectories:
-  - "../PluginBinaries/Authority"
+  - "../StellaOps.Authority.PluginBinaries"
   # "/var/lib/stellaops/authority/plugins"
 
 # Plug-in manifests live in descriptors below; per-plugin settings are stored
@@ -73,7 +73,7 @@ plugins:
       metadata:
         defaultRole: "operators"
     # Example for an external identity provider plugin. Leave disabled unless
-    # the plug-in package exists under PluginBinaries/Authority.
+    # the plug-in package exists under StellaOps.Authority.PluginBinaries.
     ldap:
       type: "ldap"
       assemblyName: "StellaOps.Authority.Plugin.Ldap"

etc/concelier.yaml.sample

@@ -15,7 +15,7 @@ storage:
 plugins:
   # Concelier resolves plug-ins relative to the content root; override as needed.
   baseDirectory: ".."
-  directory: "PluginBinaries"
+  directory: "StellaOps.Concelier.PluginBinaries"
   searchPatterns:
     - "StellaOps.Concelier.Plugin.*.dll"
 
@@ -74,6 +74,22 @@ authority:
     - "127.0.0.1/32"
     - "::1/128"
 
+mirror:
+  enabled: false
+  # Directory containing JSON exporter outputs (absolute or relative to content root).
+  exportRoot: "exports/json"
+  # Optional explicit export identifier; defaults to `latest` symlink or most recent export.
+  activeExportId: ""
+  latestDirectoryName: "latest"
+  mirrorDirectoryName: "mirror"
+  requireAuthentication: false
+  maxIndexRequestsPerHour: 600
+  domains:
+    - id: "primary"
+      displayName: "Primary Mirror"
+      requireAuthentication: false
+      maxDownloadRequestsPerHour: 1200
+
 sources:
   ghsa:
     apiToken: "${GITHUB_PAT}"

etc/notify.yaml.sample

@@ -24,6 +24,19 @@ api:
   basePath: "/api/v1/notify"
   internalBasePath: "/internal/notify"
   tenantHeader: "X-StellaOps-Tenant"
+  rateLimits:
+    deliveryHistory:
+      enabled: true
+      tokenLimit: 60
+      tokensPerPeriod: 30
+      replenishmentPeriodSeconds: 60
+      queueLimit: 20
+    testSend:
+      enabled: true
+      tokenLimit: 5
+      tokensPerPeriod: 5
+      replenishmentPeriodSeconds: 60
+      queueLimit: 2
 
 plugins:
   baseDirectory: "../"