Update file upload limits to 2GB in backend and frontend components; refactor avatar utility functions for improved name handling.

frontend/src/views/RoomView.vue

@@ -95,13 +95,13 @@ import MessageItem from '@/components/MessageItem.vue';
 import FileMessage from '@/components/FileMessage.vue';
 import ImageMessage from '@/components/ImageMessage.vue';
 import MessageInput from '@/components/MessageInput.vue';
-import { getFileDownloadUrl, downloadWithProgress, getMyIp } from '@/api/room';
+import { getFileDownloadUrl, downloadWithProgress } from '@/api/room';
 import { useWsStore } from '@/stores/wsStore';
 import type { RoomMessagePayload } from '@/types/room';
 import { isImageMimeType } from '@/types/room';
 
-// 开发时用空字符串走同源，由 Vite 代理到后端，便于其它设备通过本机 IP:5173 访问
-const API_BASE = import.meta.env.VITE_API_BASE ?? (import.meta.env.DEV ? '' : 'http://localhost:8080');
+// 未设置 VITE_API_BASE 时使用同源：开发时走 Vite 代理，Docker/生产时与页面同 host:port，避免硬编码 localhost 导致部署后连不上
+const API_BASE = import.meta.env.VITE_API_BASE ?? '';
 
 const route = useRoute();
 const router = useRouter();
@@ -128,14 +128,10 @@ onMounted(() => {
 
 watch(
   () => wsStore.status,
-  async (status) => {
+  (status) => {
     if (status === 'connected' && roomCode) {
-      try {
-        const ip = await getMyIp(API_BASE);
-        wsStore.joinRoom({ roomCode, nickname: ip?.trim() || '访客' });
-      } catch {
-        wsStore.joinRoom({ roomCode, nickname: '访客' });
-      }
+      // 使用 store 中已生成的随机中国人名
+      wsStore.joinRoom({ roomCode, nickname: wsStore.myNickname });
     }
   },
   { immediate: true },