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/web/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "hexi-web-hub",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@gravity-ui/icons": "^2.22.0",
+    "@heroui/react": "^3.2.4",
+    "@heroui/styles": "^3.2.4",
+    "react": "^19.2.8",
+    "react-dom": "^19.2.8",
+    "react-router-dom": "^7.18.3"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.3.3",
+    "@types/react": "^19.2.18",
+    "@types/react-dom": "^19.2.5",
+    "@vitejs/plugin-react": "^6.1.1",
+    "tailwindcss": "^4.3.3",
+    "typescript": "^5.0.0",
+    "vite": "^8.2.2"
+  }
+}