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/src/auth/LoginPage.tsx

@@ -0,0 +1,37 @@
+import { useState } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { Button } from '@heroui/react'
+import { useAuth } from './auth'
+
+export function LoginPage() {
+  const { login } = useAuth()
+  const navigate = useNavigate()
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+  const [err, setErr] = useState('')
+  const [loading, setLoading] = useState(false)
+
+  const submit = async () => {
+    setLoading(true); setErr('')
+    try {
+      await login(username, password)
+      navigate('/hub')
+    } catch (e: any) {
+      setErr(e.message || '登录失败')
+    } finally { setLoading(false) }
+  }
+
+  return (
+    <div className="min-h-screen bg-slate-50 text-slate-800 flex items-center justify-center">
+      <div className="w-full max-w-sm bg-white border border-slate-200 rounded-2xl shadow-sm p-8">
+        <h1 className="text-xl font-bold mb-6">HeXi 管理系统</h1>
+        <div className="space-y-4">
+          <input className="w-full border border-slate-200 rounded-lg px-3 py-2 focus:border-indigo-500 focus:outline-none" placeholder="用户名" value={username} onChange={e => setUsername(e.target.value)} />
+          <input className="w-full border border-slate-200 rounded-lg px-3 py-2 focus:border-indigo-500 focus:outline-none" type="password" placeholder="密码" value={password} onChange={e => setPassword(e.target.value)} onKeyDown={e => { if (e.key === 'Enter') submit() }} />
+          {err && <div className="text-red-500 text-sm">{err}</div>}
+          <Button className="w-full" isDisabled={loading} onPress={submit}>{loading ? '登录中…' : '登录'}</Button>
+        </div>
+      </div>
+    </div>
+  )
+}

hexi/web/src/auth/auth.tsx

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+import { createContext, useContext, useState, type ReactNode } from 'react'
+import { authLogin, clearSession, getUserName, setSession } from '../api/client'
+
+interface AuthState {
+  token: string
+  username: string
+  login: (u: string, p: string) => Promise<void>
+  logout: () => void
+}
+
+const Ctx = createContext<AuthState>({ token: '', username: '', login: async () => {}, logout: () => {} })
+
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const [token, setToken] = useState(() => localStorage.getItem('hexi_web_token') || '')
+  const [username, setUsername] = useState(() => localStorage.getItem('hexi_web_username') || '')
+  const login = async (u: string, p: string) => {
+    const data = await authLogin(u, p)
+    setSession(data.token, data.username)
+    setToken(data.token)
+    setUsername(data.username)
+  }
+  const logout = () => {
+    clearSession()
+    setToken('')
+    setUsername('')
+  }
+  return <Ctx.Provider value={{ token, username, login, logout }}>{children}</Ctx.Provider>
+}
+
+export const useAuth = () => useContext(Ctx)