feat(ui): rich forge entity views — commits, files/diff, timeline, checks, metadata chips

- server: new read routes for PR/MR commits, timeline, reviews, commit-statuses across github/gitlab/gitea; enrich PR/issue summaries with labels/assignees/milestone/commentsCount
- ui: forge facade gains getCommits/getTimeline/getChecks; shared ForgeEntityDetailView + section components; mounted into PR/MR views and issue sections

packages/web/server/lib/gitea/client.js

@@ -271,6 +271,12 @@ export function createGiteaClient({ token, baseUrl }) {
       request(`/repos/${owner}/${repo}/pulls/${number}.diff`, { raw: true }),
     pullRequestFiles: (owner, repo, number, params = {}) =>
       request(`/repos/${owner}/${repo}/pulls/${number}/files`, { query: params }),
+    pullRequestCommits: (owner, repo, number, params = {}) =>
+      request(`/repos/${owner}/${repo}/pulls/${number}/commits`, { query: params }),
+    pullRequestReviews: (owner, repo, number, params = {}) =>
+      request(`/repos/${owner}/${repo}/pulls/${number}/reviews`, { query: params }),
+    commitStatuses: (owner, repo, sha, params = {}) =>
+      request(`/repos/${owner}/${repo}/commits/${sha}/statuses`, { query: params }),
     createPullRequest: (owner, repo, body) =>
       request(`/repos/${owner}/${repo}/pulls`, { method: 'POST', body }),
     updatePullRequest: (owner, repo, number, body) =>