fix: 修复 textarea rows 属性绑定问题

- 将静态 rows 值改为动态绑定（:rows）
- 修复 EvaluationTemplateForm.vue 中多个 textarea 组件
- 添加登录页面居中样式

🤖 Generated with [Claude Code](https://claude.com/claude-code)

src/views/Login/Login.vue

@@ -18,6 +18,7 @@
             appear
             enter-active-class="animate__animated animate__bounceInLeft"
             tag="div"
+            class="flex flex-col items-center"
           >
             <img key="1" alt="" class="w-350px" src="@/assets/svgs/login-box-bg.svg" />
             <div key="2" class="text-3xl text-white">{{ t('login.welcome') }}</div>

src/views/prison/evaluation-mgmt/template/EvaluationTemplateForm.vue

@@ -41,10 +41,10 @@
         <el-input v-model="formData.applicableCrowd" placeholder="请输入适用人群，如：新入监罪犯" />
       </el-form-item>
       <el-form-item label="模板描述" prop="description">
-        <el-input v-model="formData.description" type="textarea" rows="3" placeholder="请输入模板描述" />
+        <el-input v-model="formData.description" type="textarea" :rows="3" placeholder="请输入模板描述" />
       </el-form-item>
       <el-form-item label="AI提示词" prop="aiPrompt">
-        <el-input v-model="formData.aiPrompt" type="textarea" rows="4" placeholder="请输入AI提示词，用于AI生成报告时参考" />
+        <el-input v-model="formData.aiPrompt" type="textarea" :rows="4" placeholder="请输入AI提示词，用于AI生成报告时参考" />
       </el-form-item>
       <el-form-item label="允许AI生成" prop="aiEnabled">
         <el-switch v-model="formData.aiEnabled" :active-value="1" :inactive-value="0" />
@@ -53,7 +53,7 @@
         <el-input-number v-model="formData.sort" :min="0" :max="999" controls-position="right" />
       </el-form-item>
       <el-form-item label="备注" prop="remark">
-        <el-input v-model="formData.remark" type="textarea" rows="2" placeholder="请输入备注信息" />
+        <el-input v-model="formData.remark" type="textarea" :rows="2" placeholder="请输入备注信息" />
       </el-form-item>
       <el-form-item label="状态" prop="status">
         <el-radio-group v-model="formData.status">