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

coworker/teams/__init__.py

@@ -0,0 +1,34 @@
+"""Agent teams substrate. Two append-only stores, one record discipline:
+the board log (space-scoped — a board lives and dies with its team) and the
+journal store (case-keyed — knowledge that outlives boards and teams)."""
+
+from .journal import JournalStore
+from .model import (
+    Actor,
+    AuthorityError,
+    BoardError,
+    BoardNotFoundError,
+    ChainError,
+    ItemState,
+    Role,
+)
+from .store import TeamStore
+from .tools import board_tools, journal_tools
+
+__all__ = [
+    "Actor",
+    "AuthorityError",
+    "BoardError",
+    "BoardNotFoundError",
+    "ChainError",
+    "ItemState",
+    "JournalStore",
+    "Role",
+    "TeamStore",
+    "board_tools",
+    "journal_tools",
+]
+
+# BoardDialect / LocalDialect / RemoteDialect live in .dialect, BoardTokens in
+# .tokens — imported directly by their consumers (CLI, MCP server, `/v1/board`)
+# to keep this package root light for the common in-app path.