feat: self-hosted GitLab Apps OAuth integration

Adds self-hosted GitLab OAuth sources so Coolify can connect to a self-managed GitLab instance, list private repositories, clone over an OAuth token, and deploy (the GitLab counterpart to GitHub Apps).

Hardening: authenticated, one-time team-bound OAuth callback state; token redaction in deploy logs; custom host port/path kept in clone and ls-remote URLs; submodule OAuth auth; system-wide source selection. Covered by unit and feature tests.

cosigned by OpenAI Codex at M1 Max

resources/views/livewire/project/resource/create.blade.php

@@ -6,6 +6,8 @@
         <livewire:project.new.public-git-repository :type="$type" />
     @elseif ($type === 'private-gh-app')
         <livewire:project.new.github-private-repository :type="$type" />
+    @elseif ($type === 'private-gitlab-app')
+        <livewire:project.new.gitlab-private-repository :type="$type" />
     @elseif ($type === 'private-deploy-key')
         <livewire:project.new.github-private-repository-deploy-key :type="$type" />
     @elseif ($type === 'dockerfile')