feat: OpenMesh 基础平台与 MD/PDF 转换技能

- 后端: coworker 智能体框架, WS API, 文件上传, 附件处理
- 前端: Open WebUI, 文件全量走 upload API (含 MD/TXT/JSON 等文本类)
- 技能: md-to-office (pandoc + wkhtmltopdf)
- 修复: 上传文件路径丢失, Agent 搜索浪费, 输出文件跑到 uploads/
- 打包: PyInstaller one-dir, 预打包 pandoc/wkhtmltopdf/chromium

surfaces/gui/e2e/sidebar-rows.spec.ts

@@ -0,0 +1,15 @@
+import { test, expect } from "./fixtures";
+
+// Session rows are SINGLE-LINE (UX-DECISIONS §7, 2026-07-21): title only — the
+// persona/workspace subtitle is gone (personas are launch-flagged off; when they return
+// the persona surfaces on hover, not as a second line).
+test("recent session rows render the title only — no persona subtitle", async ({ page }) => {
+  await page.goto("/");
+  const row = page
+    .locator(".sidebar .group")
+    .filter({ hasText: "Draft the launch note" })
+    .first();
+  await expect(row).toBeVisible();
+  const text = (await row.innerText()).trim();
+  expect(text).toBe("Draft the launch note");
+});