fix: make version display dynamic from package.json instead of hardcoded

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "patch-manager-ui",
   "private": true,
-  "version": "0.1.3",
+  "version": "0.1.4",
   "type": "module",
   "scripts": {
     "dev": "vite",

frontend/src/components/AppLayout.tsx

@@ -139,7 +139,7 @@ export default function AppLayout() {
       <Divider />
       <Box sx={{ p: 1.5 }}>
         <Typography variant="caption" color="text.secondary">
-           Linux Patch Manager v0.1.3
+           Linux Patch Manager v{__APP_VERSION__}
         </Typography>
       </Box>
     </Box>

frontend/src/vite-env.d.ts

@@ -0,0 +1,2 @@
+/// <reference types="vite/client" />
+declare const __APP_VERSION__: string;

frontend/vite.config.ts

@@ -2,8 +2,13 @@ import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import { resolve } from 'path'
 
+import { version } from './package.json'
+
 export default defineConfig({
   plugins: [react()],
+  define: {
+    __APP_VERSION__: JSON.stringify(version),
+  },
   resolve: {
     alias: {
       '@': resolve(__dirname, './src'),