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/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "learning-chat-admin",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix"
+  },
+  "dependencies": {
+    "@element-plus/icons-vue": "^2.3.2",
+    "axios": "^1.5.0",
+    "element-plus": "^2.14.3",
+    "pinia": "^2.1.6",
+    "vue": "^3.3.4",
+    "vue-router": "^4.2.5"
+  },
+  "devDependencies": {
+    "@types/node": "^25.6.0",
+    "@vitejs/plugin-vue": "^4.5.0",
+    "typescript": "^5.2.2",
+    "vite": "^4.5.0",
+    "vue-tsc": "^1.8.19"
+  }
+}