chore(v2): 从兴邦预审v2白名单抽取独立可运行基座

按 docs/v2/05-implementation-plan.md §1 候选迁移表与 claude_use/T00 白名单，
从 55e2cdb 抽取 224 个文件（2.48 MB）到独立目录 F:/mini-OpenClaw-v2。

- 排除：凭据(.env/server-deploy.conf/旧DELIVERY.md)、运行数据(xingbang_data 等
  4 个 SQLite)、依赖(venv/node_modules 符号链接)、归档(_backup*/test-evidence/
  ori_file)、Office 临时文件
- 目标目录独立 git 仓库，初始恢复点；Gitea 远程与分支待 OQ-06 Q2 定案
- 未部署、未启动服务、未调用模型

Co-Authored-By: Claude Code <noreply@anthropic.com>

backend/tools/python_repl_tool.py

@@ -0,0 +1,17 @@
+"""Python REPL Tool — wraps LangChain experimental PythonREPLTool."""
+
+from langchain_core.tools import BaseTool
+from langchain_experimental.tools import PythonREPLTool
+
+
+def create_python_repl_tool() -> BaseTool:
+    tool = PythonREPLTool()
+    tool.name = "python_repl"
+    tool.description = (
+        "Execute Python code in an interactive REPL environment. "
+        "Use this for calculations, data processing, running scripts, "
+        "and any task that benefits from programmatic execution. "
+        "Input should be valid Python code. "
+        "Use print() to see output."
+    )
+    return tool