test(留言分頁): 改用 timeline 分頁讀取留言

Gitea 議題留言端點無法可靠處理分頁；改由 timeline 逐頁篩選 comment 事件並去重，讓抽取、整併與 PR 留言流程取得完整集合。

test/comments-merge.test.js

@@ -55,9 +55,9 @@ function routes(overrides = {}, { body = BODY, comments = [101, 102] } = {}) {
       status: 200,
       body: { number: INDEX, ...req.body, html_url: `https://x/${INDEX}` },
     }),
-    [`GET /api/v1/repos/${REPO}/issues/${INDEX}/comments`]: {
+    [`GET /api/v1/repos/${REPO}/issues/${INDEX}/timeline`]: {
       status: 200,
-      body: comments.map((id) => ({ id, body: `留言 ${id}`, user: { login: 'someone' } })),
+      body: comments.map((id) => ({ id, type: 'comment', body: `留言 ${id}`, user: { login: 'someone' } })),
     },
   });
   for (const id of comments) {