feat: 适配 DSH 命名契约重命名（jobs/terminal/webServer）并处理 Session log 按钮位置

- tasks→jobs：ctx.jobs / job_output / job_id / session/jobs / jobsBySession / Job* 词汇
- httpServer→webServer（inject + augmentation + register/registerUpgrade）
- autoOpenTasks→autoOpenJobs 偏好键
- 右上角开关簇回到角落，注入 CSS 挤开 header 的「Session log」胶囊

src/client/layout.css

@@ -31,6 +31,16 @@
   transition: margin-bottom var(--ds-transition-duration-slow) var(--ds-ease-in-out);
 }
 
+/* When the sidebar is collapsed, the toggle cluster reclaims the top-right
+   corner. Push the DSH session header's right padding out so its right-aligned
+   utilities (the "Session log" download capsule) yield the corner instead of
+   hiding under the cluster. The header default right-pads 28px; the 2-button
+   cluster spans right 10→70px, so 78px clears it with an 8px gap. The
+   Sidebar shell toggles the body attribute with the panel open state. */
+body[data-dsh-sidebar-collapsed] #root > div > div:nth-child(2) header {
+  padding-right: 78px;
+}
+
 body[data-dsh-sidebar-dragging] #root,
 body[data-dsh-sidebar-dragging] #root > div > div:nth-child(2) {
   transition: none;