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/memory/__init__.py

@@ -0,0 +1,26 @@
+from .base import (
+    INDEX_THRESHOLD_CHARS,
+    MemoryItem,
+    MemoryStore,
+    Scope,
+    format_memories,
+    format_memory_index,
+    render_memory_block,
+)
+from .settings import MemorySettingsStore, format_user_rules
+from .sqlite_store import SQLiteMemoryStore
+from .tools import memory_tools
+
+__all__ = [
+    "INDEX_THRESHOLD_CHARS",
+    "MemoryItem",
+    "MemoryStore",
+    "MemorySettingsStore",
+    "Scope",
+    "format_memories",
+    "format_memory_index",
+    "format_user_rules",
+    "render_memory_block",
+    "SQLiteMemoryStore",
+    "memory_tools",
+]