feat: update API documentation and OpenAPI integration

- Refactored API documentation generation to utilize the new `fumadocs-openapi` features, including improved error handling and output structure.
- Replaced the Authorization security scheme with x-api-key for enhanced API key authentication.
- Added new MDX files for various API endpoints, ensuring comprehensive documentation coverage.
- Updated the OpenAPI specification to reflect the latest changes in security definitions and response schemas.
- Enhanced the documentation generation script to streamline the process and ensure consistency.

apps/docs-new/content/docs/api/admin.mdx

@@ -0,0 +1,19 @@
+---
+title: Admin
+full: true
+_openapi:
+  method: POST
+  toc:
+    - depth: 2
+      title: Admin setup Monitoring
+      url: '#admin-setup-monitoring'
+  structuredData:
+    headings:
+      - content: Admin setup Monitoring
+        id: admin-setup-monitoring
+    contents: []
+---
+
+{/* This file was generated by Fumadocs. Do not edit this file directly. Any changes should be made by running the generation command again. */}
+
+<APIPage document={"./public/openapi.json"} webhooks={[]} operations={[{"path":"/admin.setupMonitoring","method":"post"}]} showTitle={true} />