feat: add employee management, backend health check, and UI improvements

web/src/views/BackendUnavailableRouteView.vue

@@ -0,0 +1,27 @@
+<template>
+  <section class="backend-unavailable">
+    <div class="backend-card">
+      <div class="backend-badge">
+        <i class="mdi mdi-server-network-off"></i>
+      </div>
+      <h1>后端服务不可用</h1>
+      <p>{{ statusMessage }}</p>
+
+      <div class="backend-actions">
+        <button
+          type="button"
+          class="retry-btn"
+          :disabled="retrying || backendChecking"
+          @click="retry"
+        >
+          <i class="mdi" :class="retrying || backendChecking ? 'mdi-loading mdi-spin' : 'mdi-refresh'"></i>
+          <span>{{ retrying || backendChecking ? '重新检测中...' : '重新检测后端' }}</span>
+        </button>
+      </div>
+    </div>
+  </section>
+</template>
+
+<script src="./scripts/BackendUnavailableRouteView.js"></script>
+
+<style scoped src="../assets/styles/views/backend-unavailable-view.css"></style>