优化: AI Chat全栈多批审查修复与架构清理(risk_level清理/路由解耦/工具渲染/测试补测/死代码)

src/components/ErrorBoundary.vue

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+<template>
+  <!-- 全局错误兜底:子树渲染/生命周期抛错时显示降级 UI,防止白屏。
+       用法:用 <ErrorBoundary> 包裹可能出错的子组件树(slot 透传)。 -->
+  <template v-if="error">
+    <div class="error-boundary">
+      <div class="error-boundary-icon">⚠</div>
+      <div class="error-boundary-title">{{ $t('error.title') }}</div>
+      <div class="error-boundary-desc">{{ $t('error.desc') }}</div>
+      <button class="error-boundary-retry" @click="reset">{{ $t('error.retry') }}</button>
+    </div>
+  </template>
+  <slot v-else />
+</template>
+
+<script setup lang="ts">
+import { ref, onErrorCaptured } from 'vue'
+
+// errorCaptured 捕获子组件树抛出的错误(渲染/生命周期),返回 false 阻止继续向上冒泡
+const error = ref<unknown>(null)
+
+onErrorCaptured((err) => {
+  error.value = err
+  console.error('[ErrorBoundary] 子树渲染错误:', err)
+  return false
+})
+
+// 重试:重置 errorState,slot 重新挂载子树
+function reset() {
+  error.value = null
+}
+</script>
+
+<style scoped>
+.error-boundary {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  padding: 32px 16px;
+  color: var(--df-text-secondary, #888);
+  text-align: center;
+}
+.error-boundary-icon {
+  font-size: 28px;
+  color: var(--df-danger, #e5484d);
+  line-height: 1;
+}
+.error-boundary-title {
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--df-text, #333);
+}
+.error-boundary-desc {
+  font-size: 12px;
+  line-height: 1.5;
+  max-width: 360px;
+}
+.error-boundary-retry {
+  margin-top: 8px;
+  padding: 5px 16px;
+  font-size: 12px;
+  font-weight: 500;
+  font-family: var(--df-font-sans);
+  background: var(--df-accent, #7b6ff0);
+  color: #fff;
+  border: none;
+  border-radius: var(--df-radius-sm, 4px);
+  cursor: pointer;
+  transition: filter 0.15s;
+}
+.error-boundary-retry:hover {
+  filter: brightness(1.1);
+}
+</style>