Add HeXi bot codebase: custom plugins, web frontends, tests

- hexi core: message handling, rate limiting, cooldown, plugin manager
- Custom plugins: BF stats, daily check-in, quotes, persona cards, etc.
- Community plugins vendored under hexi/plugins with local fixes
- Web admin frontends (learning-chat, persona-admin), unified hexi/web
- Tests for rate_limit/cooldown/memes/persona; poetry.lock

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

hexi/plugins/nonebot_plugin_group_tools/utils/permissions.py

@@ -0,0 +1,49 @@
+from nonebot import logger
+from nonebot.adapters.onebot.v11 import Bot, GroupMessageEvent
+
+from nonebot_plugin_alconna import UniMessage
+
+from hexi.plugins.nonebot_plugin_hexi_core.custom_utils import (
+    check_bot_admin,
+    check_manage,
+)
+
+
+async def group_member_info(bot: Bot, gid: int, uid: int):
+    """获取指定群成员信息,失败返回 None"""
+    try:
+        return await bot.get_group_member_info(group_id=gid, user_id=uid, no_cache=True)
+    except Exception as e:
+        logger.exception(e)
+        return None
+
+
+async def self_member_info(bot: Bot, gid: int):
+    """获取 bot 自身的群成员信息"""
+    return await group_member_info(bot, gid, bot.self_id)
+
+
+async def honor_info(bot: Bot, gid: int, honor_type: str):
+    """获取群荣誉信息,失败返回 None"""
+    try:
+        return await bot.get_group_honor_info(group_id=gid, type=honor_type)
+    except Exception as e:
+        logger.exception(e)
+        return None
+
+
+def is_bot_manage(self_info) -> bool:
+    """bot 是否为该群的管理/群主"""
+    return bool(self_info) and self_info["role"] in ("owner", "admin")
+
+
+async def check_perm(bot: Bot, ev: GroupMessageEvent, silent: bool = False) -> bool:
+    """检查 bot 为群管理 且 用户为管理以上权限;不通过时按需回复"""
+    if not await check_bot_admin(bot, ev.group_id):
+        await UniMessage.text("咱又不是管理，你找错人了").send()
+        return False
+    if not await check_manage(bot, ev):
+        if not silent:
+            await UniMessage.text("才不听你的呢").send()
+        return False
+    return True