feat: link commits, branches and pull requests to tickets

A project can turn on a webhook for GitHub, Gitea or GitLab. Pushes and
pull or merge requests that name a ticket key show on that ticket under
Desarrollo, with the state of each pull request; the secret is shown and
rotated from the project settings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/domain/src/lib/read-models/issue.read-model.ts

@@ -1,3 +1,4 @@
+import { DevLink } from '../issue/dev-link';
 import { IssueLinkType, IssuePriority } from '../issue/issue.enums';
 import { StatusCategory } from '../project/project-settings';
 import { UserRefReadModel } from './user-ref.read-model';
@@ -84,6 +85,8 @@ export class IssueReadModel {
   /** Place in the backlog (and in each board column): ascending. */
   rank!: string;
   checklist!: ChecklistItemReadModel[];
+  /** Commits, branches and pull requests that mention it. */
+  devLinks!: DevLink[];
   commentCount!: number;
   createdAt!: string;
   updatedAt!: string;