fix(mp): Phase 3 品质打磨 — Loading优化+ErrorBoundary重试上限+登录安全+输入限制

- Loading 组件区分列表底部状态（无spinner）vs 加载中状态
- ErrorBoundary 添加 MAX_RETRIES=3 限制，超出提示重启
- login 页 IS_SIMULATOR 改为 === 'develop' 精确匹配
- login 密码输入 type 改为 safe-password 防截屏
- appointment/create 备注输入添加 maxlength=200
- GuestHome "查看全部" 导航到文章列表页

apps/miniprogram/src/pages/login/index.tsx

@@ -6,7 +6,7 @@ import { useAuthStore } from '../../stores/auth';
 import './index.scss';
 
 const IS_DEV = process.env.NODE_ENV !== 'production';
-const IS_SIMULATOR = typeof __wxConfig !== 'undefined' && (__wxConfig as any).envVersion !== 'release';
+const IS_SIMULATOR = typeof __wxConfig !== 'undefined' && (__wxConfig as any).envVersion === 'develop';
 
 export default function Login() {
   const [username, setUsername] = useState('');
@@ -158,7 +158,7 @@ export default function Login() {
           <View className="login-field">
             <Input
               className="login-input"
-              type="text"
+              type="safe-password"
               password={!showPassword}
               placeholder="请输入密码"
               placeholderClass="login-placeholder"