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/interactions.py

@@ -0,0 +1,63 @@
+"""Interactive prompts over messaging — buttons instead of free-text replies.
+
+When an Inbox item is mirrored to a channel, discrete choices (approve/deny, an ask_user option)
+render as **buttons**. The item id rides in each button's value, so a click resolves the exact
+item — no `[ow:id]`-in-reply fragility, no thread tracking. Free-text answers aren't offered over
+messaging (the user opens the app for those).
+
+Provider-agnostic: a `Button` is `(label, value)`; each adapter renders it natively (Slack Block
+Kit, Telegram inline keyboard, …). The value is opaque to the adapter — `encode`/`decode` here own
+its meaning: `(item_id, resolution)`.
+"""
+
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass
+from typing import Optional
+
+from .inbox import KIND_APPROVAL, KIND_QUESTION
+from .tools.ask import option_label
+
+
+@dataclass
+class Button:
+    label: str
+    value: str  # opaque to the adapter; encode()/decode() own its meaning
+
+
+def encode(item_id: str, resolution: str) -> str:
+    return json.dumps({"id": item_id, "r": resolution})
+
+
+def decode(value: str) -> Optional[tuple[str, str]]:
+    """`(item_id, resolution)` from a button value, or None if it isn't ours."""
+    try:
+        d = json.loads(value)
+        if isinstance(d, dict) and d.get("id"):
+            return str(d["id"]), str(d.get("r", ""))
+    except Exception:
+        pass
+    return None
+
+
+def buttons_for(item) -> list[Button]:
+    """The discrete-choice buttons for an Inbox item, or [] if it has none (free-text question,
+    notification, …) — the caller then sends plain text with an "open the app" hint."""
+    if item.kind == KIND_APPROVAL:
+        return [
+            Button("Approve", encode(item.id, "allow")),
+            Button("Deny", encode(item.id, "deny")),
+        ]
+    if item.kind == KIND_QUESTION and getattr(item, "questions", None):
+        # Grouped questions (OPE-51): one button row can't answer 2+ questions — send plain text
+        # with the open-the-app hint instead.
+        return []
+    if item.kind == KIND_QUESTION and getattr(item, "options", None):
+        # One button per option; the resolution IS the chosen option's label (what the agent
+        # gets). Rich {label, description, …} options button as their label.
+        return [
+            Button(option_label(opt), encode(item.id, option_label(opt)))
+            for opt in item.options
+        ]
+    return []