Update server port configuration from 8080 to 48080 in both backend and frontend settings.

backend/src/main/resources/application.yml

@@ -1,5 +1,5 @@
 server:
-  port: 8080
+  port: 48080
 
 spring:
   datasource:

frontend/vite.config.ts

@@ -6,11 +6,11 @@ export default defineConfig({
   server: {
     proxy: {
       '/api': {
-        target: 'http://localhost:8080',
+        target: 'http://localhost:48080',
         changeOrigin: true,
       },
       '/ws': {
-        target: 'ws://localhost:8080',
+        target: 'ws://localhost:48080',
         ws: true,
       },
     },