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>

apps/api/schema.gql

@@ -203,6 +203,34 @@ type CumulativeFlow {
   series: [FlowSeries!]!
 }
 
+"""A commit, branch or pull request that mentions the ticket"""
+type DevLink {
+  at: String!
+  author: String
+  kind: DevLinkKind!
+
+  """github, gitea or gitlab"""
+  provider: String!
+
+  """Short SHA, branch or PR number"""
+  ref: String!
+  state: DevLinkState
+  title: String!
+  url: String!
+}
+
+enum DevLinkKind {
+  BRANCH
+  COMMIT
+  PULL_REQUEST
+}
+
+enum DevLinkState {
+  CLOSED
+  MERGED
+  OPEN
+}
+
 type DurationStats {
   averageDays: Float
   count: Int!
@@ -222,6 +250,19 @@ type FlowSeries {
   status: String!
 }
 
+"""
+Webhook from GitHub, Gitea or GitLab: commits, branches and pull requests naming a ticket key are linked to it
+"""
+type GitIntegration {
+  enabled: Boolean!
+
+  """Webhook secret; only owners and admins see it"""
+  secret: String
+
+  """Path of the webhook on this API"""
+  webhookPath: String!
+}
+
 type Issue {
   """Statuses this ticket can move to next (project's workflow)"""
   allowedTransitions: [String!]!
@@ -235,6 +276,9 @@ type Issue {
   comments(limit: Int! = 50, offset: Int! = 0): CommentPage!
   createdAt: String!
   description: String
+
+  """Commits, branches and pull requests that mention it"""
+  devLinks: [DevLink!]!
   dueDate: String
   figmaUrl: String
 
@@ -435,8 +479,12 @@ type Mutation {
 
   """Delete a sprint that never started; its tickets go back to the backlog"""
   deleteSprint(sprintId: ID!): CommandResult!
+  disableGitIntegration(projectId: ID!): Boolean!
   editComment(body: String!, commentId: ID!): CommandResult!
 
+  """Turn the Git webhook on, with a new secret (also to rotate it)"""
+  enableGitIntegration(projectId: ID!): GitIntegration!
+
   """Relate tickets, e.g. FE DEPENDS_ON BE, QA TESTS FE"""
   linkIssues(input: LinkIssuesInput!): CommandResult!
 
@@ -681,6 +729,7 @@ type Query {
   A project's epics: top-level tickets that group others, with the progress of those
   """
   epics(projectId: ID!): [Epic!]!
+  gitIntegration(projectId: ID!): GitIntegration!
   issue(
     """Issue id or key (e.g. "TS-42")"""
     idOrKey: String!