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/playwright.config.ts

@@ -0,0 +1,26 @@
+import { defineConfig, devices } from "@playwright/test";
+
+// E2E harness for the GUI. Tests are hermetic: every /v1 request and the event WebSocket are mocked
+// at the network layer (see e2e/fixtures.ts), so they run without the Python backend and never
+// mutate real state — safe for CI and for asserting regressions in the interaction flows.
+const PORT = 5199;
+
+export default defineConfig({
+  testDir: "./e2e",
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 1 : 0,
+  reporter: process.env.CI ? "line" : [["list"]],
+  use: {
+    baseURL: `http://localhost:${PORT}`,
+    trace: "on-first-retry",
+  },
+  projects: [{ name: "chromium", use: { ...devices["Desktop Chrome"] } }],
+  webServer: {
+    // Dev server on a dedicated port so it never collides with a running `npm run dev` (5173).
+    command: `npm run dev -- --port ${PORT} --strictPort`,
+    url: `http://localhost:${PORT}`,
+    reuseExistingServer: !process.env.CI,
+    timeout: 120_000,
+  },
+});