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/src-tauri/Info.plist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<!-- Merged into the bundle's Info.plist by Tauri. These usage strings appear inside the macOS
+     permission prompts (Desktop/Documents/Downloads/Photos), so a prompt the user didn't expect
+     at least explains itself — the agent's tool runs are what touch these folders, and only when
+     a task needs them. -->
+<plist version="1.0">
+<dict>
+  <key>NSMicrophoneUsageDescription</key>
+  <string>OpenWorker records only while you use the composer microphone to turn your spoken prompt into editable text. Audio is transcribed locally and is not uploaded.</string>
+  <key>NSDesktopFolderUsageDescription</key>
+  <string>A task you run may need to read or save files on your Desktop. OpenWorker never scans this folder on its own.</string>
+  <key>NSDocumentsFolderUsageDescription</key>
+  <string>A task you run may need to read or save files in Documents. OpenWorker never scans this folder on its own.</string>
+  <key>NSDownloadsFolderUsageDescription</key>
+  <string>A task you run may need to read or save files in Downloads. OpenWorker never scans this folder on its own.</string>
+  <key>NSPhotoLibraryUsageDescription</key>
+  <string>A task you run may need to read an image from your photo library. OpenWorker never scans your photos on its own.</string>
+</dict>
+</plist>