Add Northflank sync features and enhance documentation

- Implemented new Northflank sync functionality, including routes for listing secret groups and managing syncs.
- Added types and schemas for Northflank projects and secret groups to improve data handling.
- Updated frontend components to support Northflank sync configuration and review.
- Enhanced API documentation with detailed instructions for Northflank integration and usage.
- Included new images and examples in the documentation for better clarity.

backend/src/services/app-connection/northflank/northflank-connection-service.ts

@@ -2,8 +2,11 @@ import { logger } from "@app/lib/logger";
 import { OrgServiceActor } from "@app/lib/types";
 
 import { AppConnection } from "../app-connection-enums";
-import { listProjects as getNorthflankProjects } from "./northflank-connection-fns";
-import { TNorthflankConnection } from "./northflank-connection-types";
+import {
+  listProjects as getNorthflankProjects,
+  listSecretGroups as getNorthflankSecretGroups
+} from "./northflank-connection-fns";
+import { TNorthflankConnection, TNorthflankSecretGroup } from "./northflank-connection-types";
 
 type TGetAppConnectionFunc = (
   app: AppConnection,
@@ -24,7 +27,24 @@ export const northflankConnectionService = (getAppConnection: TGetAppConnectionF
     }
   };
 
+  const listSecretGroups = async (
+    connectionId: string,
+    projectId: string,
+    actor: OrgServiceActor
+  ): Promise<TNorthflankSecretGroup[]> => {
+    const appConnection = await getAppConnection(AppConnection.Northflank, connectionId, actor);
+    try {
+      const secretGroups = await getNorthflankSecretGroups(appConnection, projectId);
+
+      return secretGroups;
+    } catch (error) {
+      logger.error({ error, connectionId, projectId, actor: actor.type }, "Failed to list Northflank secret groups");
+      return [];
+    }
+  };
+
   return {
-    listProjects
+    listProjects,
+    listSecretGroups
   };
 };