Slice 5: Gitea forge - PRs and Merge & clean up

New internal/forge (provider-abstracted, Gitea impl via code.gitea.io/sdk/gitea) with tested remote-URL parsing and read+write ops: list open PRs, and merge-and-cleanup (squash-merge + delete head branch when head/base share a repo). Service resolves repo->owner/repo from remotes (prefers origin) and records a pr-merged event; config gains GITEA_URL/GITEA_TOKEN (forge disabled without both). MCP tools list_prs and merge_and_cleanup_pr (merge tool tells Claude to confirm first, 1.4). HTTP GET /api/repo/prs, POST /api/repo/pr/merge. New <pr-list> component with a confirming Merge & clean up button, hidden when no forge. Verified graceful-disabled path; real merge pending token + a designated PR.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/templates/index.html

@@ -11,6 +11,7 @@
   <script type="module" src="/components/repo-detail/repo-detail.js"></script>
   <script type="module" src="/components/activity-feed/activity-feed.js"></script>
   <script type="module" src="/components/handoff-bar/handoff-bar.js"></script>
+  <script type="module" src="/components/pr-list/pr-list.js"></script>
   <style>
     header {
       display: flex;
@@ -31,6 +32,7 @@
       gap: 16px;
       align-items: start;
     }
+    .right { display: grid; gap: 16px; }
     @media (max-width: 720px) { .cols { grid-template-columns: 1fr; } }
   </style>
 </head>
@@ -44,7 +46,10 @@
     <handoff-bar></handoff-bar>
     <div class="cols">
       <repo-list></repo-list>
-      <repo-detail></repo-detail>
+      <div class="right">
+        <repo-detail></repo-detail>
+        <pr-list hidden></pr-list>
+      </div>
     </div>
     <activity-feed></activity-feed>
   </main>