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/handlers/__init__.py

@@ -0,0 +1,3 @@
+"""handlers 包：触发器(Trigger)层。"""
+
+from .entry import cmd  # noqa: F401

plugin_template/nonebot_plugin_template/handlers/entry.py

@@ -0,0 +1,29 @@
+"""触发器(Trigger)层：接触发 → 鉴权 → 调 service → 出 View。"""
+
+from __future__ import annotations
+
+from nonebot import on_command
+from nonebot.adapters import Message
+from nonebot.rule import to_me
+from nonebot.params import CommandArg
+from nonebot_plugin_alconna import UniMessage
+
+from hexi.web_config import get_effective_value
+
+from ..services.main import do_something
+
+_PLUGIN_ID = __package__.rsplit(".", 1)[0]
+
+cmd = on_command("模板指令", aliases={"模板"}, rule=to_me(), priority=10, block=True)
+
+
+@cmd.handle()
+async def handle(arg: Message = CommandArg()):
+    if not get_effective_value(_PLUGIN_ID, "enable", True):
+        await cmd.finish("模板插件已停用")
+        return
+    text = arg.extract_plain_text().strip()
+    if not text:
+        await cmd.finish("请提供要记录的内容")
+    result = await do_something(text)
+    await UniMessage.text(result).send()