feat(wtfllm): 接入 nonebot-plugin-wtfllm AI 帮助助手

- pyproject 注册 nonebot_plugin_wtfllm 插件
- 新增 wtfllm_gate 插件:仅在群 621016172 启用 wtfllm 响应
- 新增 kb_build:抓取 danding.vip 文档并导入 wtfllm 知识库的脚本
- requirements: 升级 nonebot2 2.5.0 / pydantic 2.13.5,补 aiohttp 与 wtfllm 依赖

danding_bot/plugins/wtfllm_gate.py

@@ -0,0 +1,17 @@
+"""wtfllm 群启用范围控制:仅允许在指定群及私聊中触发。"""
+from nonebot import get_driver
+from nonebot.exception import IgnoredException
+from nonebot.message import run_preprocessor
+from nonebot.adapters.onebot.v11 import GroupMessageEvent
+
+from nonebot_plugin_wtfllm import __plugin_meta__  # noqa: F401  确保插件已加载
+
+WTFLLM_ENABLED_GROUPS = {"621016172"}
+
+
+@run_preprocessor
+async def gate_wtfllm_groups(matcher, event):
+    if matcher.plugin_name != "nonebot_plugin_wtfllm":
+        return
+    if isinstance(event, GroupMessageEvent) and str(event.group_id) not in WTFLLM_ENABLED_GROUPS:
+        raise IgnoredException("wtfllm 仅在指定群启用")