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>

bot.py

@@ -0,0 +1,34 @@
+import nonebot
+from nonebot.adapters.onebot.v11 import Adapter as ONEBOTV11Adapter
+from nonebot.log import logger
+from sqlalchemy import StaticPool
+from starlette.middleware.cors import CORSMiddleware
+
+# 初始化 NoneBot 以及 数据库
+nonebot.init(datastore_engine_options={"poolclass": StaticPool})
+
+# 获取应用和驱动实例
+app = nonebot.get_app()
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[
+        "http://localhost:5173",
+        "http://192.168.2.186:5173",
+        "http://127.0.0.1:5173"
+    ],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+driver = nonebot.get_driver()
+
+# 注册适配器
+driver.register_adapter(ONEBOTV11Adapter)
+
+# 加载插件
+nonebot.load_plugins("hexi")
+nonebot.load_from_toml("pyproject.toml")
+
+if __name__ == "__main__":
+    logger.warning("hexi？启动！")
+    nonebot.run()  # 直接运行，不需要传参