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

.gitignore

@@ -0,0 +1,30 @@
+.venv/
+__pycache__/
+*.pyc
+.pytest_cache/
+*.egg-info/
+build/
+dist/
+.coverage
+
+# Runtime data — never committed
+workspace/uploads/
+workspace/[0-9]*_*.*   # timestamped upload files
+data/scratch/
+data/state.db
+data/state.db-journal
+data/state.db-wal
+data/state.db-shm
+openmesh-server.exe.bak_pyz
+
+# Local secrets (live-smoke BYO keys) — never committed
+.env
+.claude/settings.local.json
+
+# IDE
+.idea/
+.vscode/
+*.swp
+patch_pyz.py        # 临时热补丁脚本
+check_patch.py
+01.txt