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/tools/git.py

@@ -0,0 +1,90 @@
+"""`git_log` — recent commit history for context (read-only).
+
+aisuite's git toolkit gives `git_status`/`git_diff`; this adds history so the agent can see how
+a file came to be the way it is before changing it. Read-only; no commit/push here (the prompt
+forbids those without explicit ask, and they'd go through run_shell anyway).
+"""
+
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+from typing import Any, Optional
+
+import aisuite as ai
+
+_SEP = "\x1f"
+
+_SCHEMA = {
+    "type": "function",
+    "function": {
+        "name": "git_log",
+        "description": (
+            "Recent git commit history (hash, author, date, subject). Optionally scope to a path. "
+            "Use it to understand how code evolved before editing. Read-only."
+        ),
+        "parameters": {
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string",
+                    "description": "Optional file/dir to scope history to.",
+                },
+                "max_count": {
+                    "type": "integer",
+                    "description": "How many commits (default 20, max 200).",
+                },
+            },
+        },
+    },
+}
+
+
+def git_tools(workspace: str) -> list:
+    root = str(Path(workspace).resolve())
+
+    def git_log(path: Optional[str] = None, max_count: int = 20) -> dict[str, Any]:
+        n = max_count if isinstance(max_count, int) and max_count > 0 else 20
+        n = min(n, 200)
+        cmd = [
+            "git",
+            "-C",
+            root,
+            "log",
+            f"-n{n}",
+            f"--pretty=format:%h{_SEP}%an{_SEP}%ad{_SEP}%s",
+            "--date=short",
+        ]
+        if path:
+            cmd += ["--", path]
+        try:
+            out = subprocess.run(cmd, capture_output=True, text=True, timeout=15)
+        except Exception as exc:
+            return {"error": f"git log failed: {exc}"}
+        if out.returncode != 0:
+            return {"error": (out.stderr or "git log failed").strip()[:300]}
+        commits = []
+        for line in out.stdout.splitlines():
+            parts = line.split(_SEP)
+            if len(parts) == 4:
+                commits.append(
+                    {
+                        "hash": parts[0],
+                        "author": parts[1],
+                        "date": parts[2],
+                        "subject": parts[3],
+                    }
+                )
+        return {"count": len(commits), "commits": commits}
+
+    git_log.__name__ = "git_log"
+    git_log.__doc__ = _SCHEMA["function"]["description"]
+    git_log.__aisuite_tool_metadata__ = ai.ToolMetadata(
+        name="git_log",
+        category="git",
+        risk_level="low",
+        capabilities=["git"],
+        requires_approval=False,
+    )
+    git_log.__coworker_schema__ = _SCHEMA
+    return [git_log]