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>

plugin_template/nonebot_plugin_template/__init__.py

@@ -0,0 +1,38 @@
+"""<插件名> — MTSS 结构 + 统一配置标准参考模板。
+
+放在 hexi/plugins/ 后改名：目录 nonebot_plugin_<name>，并替换所有
+`nonebot_plugin_template` / `template` 占位(建议全局搜索替换)。
+
+结构：Trigger(handlers) → Service(services) → Model(repository/models)。
+配置在 config.py 统一注册，Web 可读可改。
+"""
+
+from nonebot import require
+from nonebot.plugin import PluginMetadata
+
+require("nonebot_plugin_alconna")
+
+__plugin_meta__ = PluginMetadata(
+    name="插件模板",
+    description="MTSS 结构 + 统一配置标准参考模板",
+    usage="模板指令 [参数]",
+    type="application",
+)
+
+# 入口只做四件事：require / meta / 导入子模块 / 配置注册
+from . import config as _config  # noqa: E402,F401
+from . import handlers as _handlers  # noqa: E402,F401
+from . import web as _web  # noqa: E402,F401
+
+from hexi.web_plugin_registry import register_web_plugin  # noqa: E402
+
+_config.register_config()
+
+# 注册到统一 Web 管理台(/hub)：hub 启动时自动挂载 /api/template
+register_web_plugin(
+    "template",
+    "插件模板",
+    "user",
+    lambda: _web.build_admin_app(),
+    module_name=__name__,
+)