Enhance: 城市主图显示名称并加重

src/views/CityIntroductionView.vue

@@ -8,6 +8,9 @@
     <div class="main-content">
       <div class="city-banner">
         <img src="https://images.unsplash.com/photo-1477959858617-67f85cf4f1df?w=1200&h=400&fit=crop" alt="城市风景" class="banner-image" />
+        <div class="banner-overlay">
+          <h1 class="city-name">{{ cityName }}</h1>
+        </div>
       </div>
 
       <div class="city-info-section">
@@ -129,6 +132,8 @@ import { useRouter } from 'vue-router'
 
 const router = useRouter()
 
+const cityName = ref('魅力之城')
+
 const attractions = ref([
   {
     id: 1,
@@ -379,6 +384,27 @@ const sendMessage = (user) => {
   object-fit: cover;
 }
 
+.banner-overlay {
+  position: absolute;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.3) 100%);
+  padding: 24px;
+  display: flex;
+  align-items: flex-end;
+  justify-content: center;
+}
+
+.city-name {
+  font-size: 36px;
+  font-weight: 800;
+  color: white;
+  margin: 0;
+  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
+  letter-spacing: 2px;
+}
+
 .city-info-section,
 .attractions-section,
 .nearby-users-section,