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/tailwind.config.js

@@ -0,0 +1,52 @@
+/** Tailwind config — mirrors platform/ui-mocks/redesign.html so the app can use the mock's
+ *  exact utility classes. Colors map to the CSS custom properties already defined in styles.css
+ *  (so light/dark theming flows through one source of truth). */
+// Tokens are hex CSS vars (shared with styles.css), which Tailwind can't alpha-multiply for
+// `/NN` opacity utilities. Wrap each in color-mix so `bg-panel/70` etc. work, while bare
+// `var(--x)` usage in styles.css stays intact. (color-mix is supported in the Chromium webview.)
+const tok = (name) => ({ opacityValue }) =>
+  opacityValue === undefined
+    ? `var(${name})`
+    : `color-mix(in srgb, var(${name}) calc(${opacityValue} * 100%), transparent)`;
+
+/** @type {import('tailwindcss').Config} */
+export default {
+  darkMode: ["selector", '[data-theme="dark"]'],
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        paper: tok("--paper"),
+        panel: tok("--panel"),
+        canvas: tok("--canvas"),
+        chrome: tok("--chrome"),
+        chromeHover: tok("--chrome-hover"),
+        ink: tok("--ink"),
+        muted: tok("--muted"),
+        faint: tok("--faint"),
+        line: tok("--line"),
+        lineStrong: tok("--line-strong"),
+        accent: tok("--accent"),
+        accentSoft: tok("--accent-soft"),
+        ok: tok("--ok"),
+        okSoft: tok("--ok-soft"),
+        okLine: tok("--ok-line"),
+        warnInk: tok("--warn-ink"),
+        warnSoft: tok("--warn-soft"),
+        danger: tok("--danger"),
+        dangerSoft: tok("--danger-soft"),
+        tealInk: tok("--teal-ink"),
+        tealSoft: tok("--teal-soft"),
+        tealLine: tok("--teal-line"),
+        solid: tok("--solid"),
+        onSolid: tok("--on-solid"),
+      },
+      fontFamily: {
+        sans: ["-apple-system", "BlinkMacSystemFont", "Segoe UI", "Inter", "system-ui", "sans-serif"],
+        mono: ["SF Mono", "JetBrains Mono", "Menlo", "monospace"],
+      },
+      borderRadius: { xl2: "14px" },
+    },
+  },
+  plugins: [],
+};