fix: 支持显示最后一条消息

backend/src/main/java/com/openisle/config/ChannelInitializer.java

@@ -18,14 +18,14 @@ public class ChannelInitializer implements CommandLineRunner {
             chat.setChannel(true);
             chat.setName("吹水群");
             chat.setDescription("吹水聊天");
-            chat.setAvatar("/default-avatar.svg");
+            chat.setAvatar("https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/32647273e2334d14adfd4a6ce9db0643.jpeg");
             conversationRepository.save(chat);
 
             MessageConversation tech = new MessageConversation();
             tech.setChannel(true);
             tech.setName("技术讨论群");
             tech.setDescription("讨论技术相关话题");
-            tech.setAvatar("/default-avatar.svg");
+            tech.setAvatar("https://openisle-1307107697.cos.accelerate.myqcloud.com/dynamic_assert/5edde9a5864e471caa32491dbcdaa8b2.png");
             conversationRepository.save(tech);
         }
     }

backend/src/main/java/com/openisle/config/SecurityConfig.java

@@ -121,6 +121,7 @@ public class SecurityConfig {
                     .requestMatchers(HttpMethod.GET, "/api/reaction-types").permitAll()
                     .requestMatchers(HttpMethod.GET, "/api/activities/**").permitAll()
                     .requestMatchers(HttpMethod.GET, "/api/sitemap.xml").permitAll()
+                    .requestMatchers(HttpMethod.GET, "/api/channels").permitAll()
                     .requestMatchers(HttpMethod.GET, "/api/rss").permitAll()
                     .requestMatchers(HttpMethod.GET, "/api/point-goods").permitAll()
                     .requestMatchers(HttpMethod.POST, "/api/point-goods").permitAll()
@@ -156,7 +157,7 @@ public class SecurityConfig {
                         uri.startsWith("/api/search") || uri.startsWith("/api/users") ||
                          uri.startsWith("/api/reaction-types") || uri.startsWith("/api/config") ||
                          uri.startsWith("/api/activities") || uri.startsWith("/api/push/public-key") ||
-                                uri.startsWith("/api/point-goods") ||
+                                uri.startsWith("/api/point-goods") || uri.startsWith("/api/channels") ||
                          uri.startsWith("/api/sitemap.xml") || uri.startsWith("/api/medals") ||
                          uri.startsWith("/api/rss"));
 

backend/src/main/java/com/openisle/dto/ChannelDto.java

@@ -10,6 +10,7 @@ public class ChannelDto {
     private String name;
     private String description;
     private String avatar;
+    private MessageDto lastMessage;
     private long memberCount;
     private boolean joined;
     private long unreadCount;

frontend_nuxt/pages/message-box/[id].vue

@@ -22,8 +22,13 @@
         </div>
         <BaseTimeline :items="messages">
           <template #item="{ item }">
-            <div class="message-timestamp">
+            <div class="message-header">
-              {{ TimeManager.format(item.createdAt) }}
+              <div class="user-name">
+                {{ item.sender.username }}
+              </div>
+              <div class="message-timestamp">
+                {{ TimeManager.format(item.createdAt) }}
+              </div>
             </div>
             <div class="message-content">
               <div class="info-content-text" v-html="renderMarkdown(item.content)"></div>
@@ -448,10 +453,22 @@ onUnmounted(() => {
 .message-timestamp {
   font-size: 11px;
   color: var(--text-color-secondary);
-  margin-top: 5px;
   opacity: 0.6;
 }
 
+.message-header {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  gap: 10px;
+}
+
+.user-name {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-color);
+}
+
 .message-item.sent {
   align-self: flex-end;
   flex-direction: row-reverse;

frontend_nuxt/pages/message-box/index.vue

@@ -97,7 +97,11 @@
               <div class="message-time">成员 {{ ch.memberCount }}</div>
             </div>
             <div class="last-message-row">
-              <div class="last-message">{{ ch.description }}</div>
+              <div class="last-message">
+                {{
+                  ch.lastMessage ? stripMarkdownLength(ch.lastMessage.content, 100) : ch.description
+                }}
+              </div>
             </div>
           </div>
         </div>
@@ -262,8 +266,6 @@ function goToConversation(id) {
 
 <style scoped>
 .messages-container {
-  margin: 0 auto;
-  padding: 20px;
 }
 
 .tabs {
@@ -291,6 +293,8 @@ function goToConversation(id) {
 
 .search-container {
   margin-bottom: 24px;
+  margin-left: 20px;
+  margin-right: 20px;
 }
 
 .messages-header {
@@ -330,6 +334,8 @@ function goToConversation(id) {
 .conversation-item {
   display: flex;
   align-items: center;
+  margin-left: 20px;
+  margin-right: 20px;
   padding: 8px 10px;
   cursor: pointer;
   transition: background-color 0.2s ease;
@@ -415,8 +421,9 @@ function goToConversation(id) {
 
 /* 响应式设计 */
 @media (max-width: 768px) {
-  .messages-container {
+  .conversation-item {
-    padding: 10px 10px;
+    margin-left: 10px;
+    margin-right: 10px;
   }
 
   .messages-title {