feat(web): filter GitLab merge requests by source branch

packages/web/server/lib/gitlab/routes.js

@@ -507,6 +507,7 @@ export function registerGitLabRoutes(app, options = {}) {
       const rawPage = typeof req.query?.page === 'string' ? Number(req.query.page) : 1;
       const effectivePage = Number.isFinite(rawPage) && rawPage > 0 ? rawPage : 1;
       const searchQuery = asString(req.query?.query);
+      const sourceBranch = asString(req.query?.sourceBranch);
 
       const client = await getClient();
       if (!client) {
@@ -522,6 +523,9 @@ export function registerGitLabRoutes(app, options = {}) {
       if (searchQuery) {
         params.search = searchQuery;
       }
+      if (sourceBranch) {
+        params.source_branch = sourceBranch;
+      }
       const resp = await withTimeout(client.mergeRequests(projectPath, params), ROUTE_TIMEOUT_MS, 'gitlab mrs list');
       if (resp.status === 429) {
         return res.status(503).json({ error: 'GitLab rate limited' });