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/gitlab.mdx

@@ -0,0 +1,48 @@
+---
+title: Gitlab
+full: true
+_openapi:
+  toc:
+    - depth: 2
+      title: Gitlab create
+      url: '#gitlab-create'
+    - depth: 2
+      title: Gitlab one
+      url: '#gitlab-one'
+    - depth: 2
+      title: Gitlab gitlab Providers
+      url: '#gitlab-gitlab-providers'
+    - depth: 2
+      title: Gitlab get Gitlab Repositories
+      url: '#gitlab-get-gitlab-repositories'
+    - depth: 2
+      title: Gitlab get Gitlab Branches
+      url: '#gitlab-get-gitlab-branches'
+    - depth: 2
+      title: Gitlab test Connection
+      url: '#gitlab-test-connection'
+    - depth: 2
+      title: Gitlab update
+      url: '#gitlab-update'
+  structuredData:
+    headings:
+      - content: Gitlab create
+        id: gitlab-create
+      - content: Gitlab one
+        id: gitlab-one
+      - content: Gitlab gitlab Providers
+        id: gitlab-gitlab-providers
+      - content: Gitlab get Gitlab Repositories
+        id: gitlab-get-gitlab-repositories
+      - content: Gitlab get Gitlab Branches
+        id: gitlab-get-gitlab-branches
+      - content: Gitlab test Connection
+        id: gitlab-test-connection
+      - content: Gitlab update
+        id: gitlab-update
+    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":"/gitlab.create","method":"post"},{"path":"/gitlab.one","method":"get"},{"path":"/gitlab.gitlabProviders","method":"get"},{"path":"/gitlab.getGitlabRepositories","method":"get"},{"path":"/gitlab.getGitlabBranches","method":"get"},{"path":"/gitlab.testConnection","method":"post"},{"path":"/gitlab.update","method":"post"}]} showTitle={true} />