添加获取单个 Issue 的功能，更新相关类型和环境变量

agent/routes/issues/list.ts

@@ -49,4 +49,37 @@ app.route({
 
   const res = await cnb.issue.getList(repo, params);
   ctx.forward(res);
+}).addTo(app);
+
+app.route({
+  path: 'cnb',
+  key: 'getIssue',
+  description: '获取 单个 Issue',
+  middleware: ['auth'],
+  metadata: {
+    tags: ['opencode'],
+    ...createSkill({
+      skill: 'getIssue',
+      title: '获取 单个 Issue',
+      args: {
+        repo: tool.schema.string().optional().describe('代码仓库名称, 如 my-user/my-repo'),
+        issueNumber: tool.schema.union([tool.schema.string(), tool.schema.number()]).describe('Issue 编号'),
+      },
+      summary: '获取 单个 Issue',
+    })
+  }
+}).define(async (ctx) => {
+  const cnb = await cnbManager.getContext(ctx);
+  let repo = ctx.query?.repo || useKey('CNB_REPO_SLUG_LOWERCASE');
+  const issueNumber = ctx.query?.issueNumber;
+
+  if (!repo) {
+    ctx.throw(400, '缺少参数 repo');
+  }
+  if (!issueNumber) {
+    ctx.throw(400, '缺少参数 issueNumber');
+  }
+
+  const res = await cnb.issue.getItem(repo, issueNumber);
+  ctx.forward(res);
 }).addTo(app);