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_learning_chat/web/learning-chat-admin/vite.config.ts

@@ -0,0 +1,26 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import path from 'node:path'
+
+export default defineConfig({
+    plugins: [vue()],
+    // 构建产物由 bot 在 /learning_chat 路径下提供
+    base: '/learning_chat/',
+    resolve: {
+        alias: {
+            '@': path.resolve(process.cwd(), 'src'),
+        },
+    },
+    server: {
+        port: 5173,
+        open: false,
+        host: '0.0.0.0',
+        // 开发模式下 API 请求转发到 bot 端口
+        proxy: {
+            '/learning_chat/api': {
+                target: 'http://localhost:39697',
+                changeOrigin: true,
+            },
+        },
+    },
+})