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_galgame_card/web/persona-admin/tailwind.config.js

@@ -0,0 +1,12 @@
+import { heroui } from "@heroui/theme";
+
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    "./index.html",
+    "./src/**/*.{js,ts,jsx,tsx}",
+    "./node_modules/@heroui/theme/dist/**/*.{js,ts,jsx,tsx}",
+  ],
+  darkMode: "class",
+  plugins: [heroui()],
+};