refactor: use withLingo pattern in vite config

Extract Lingo compiler configuration to withLingo function
following the AdonisJS example. Keep defineConfig since it's
needed for the Sentry integration that uses the config parameter.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: davidturnbull

demo/the-epic-stack/vite.config.ts

@@ -83,6 +83,17 @@ const viteConfig: UserConfig = {
 	},
 }
 
+const withLingo = lingoCompiler.vite({
+	sourceRoot: 'app',
+	lingoDir: 'lingo',
+	sourceLocale: 'en',
+	targetLocales: ['es'],
+	rsc: false,
+	useDirective: false,
+	debug: false,
+	models: 'lingo.dev',
+})
+
 export default defineConfig((config) => {
 	const configWithSentry = {
 		...viteConfig,
@@ -94,14 +105,5 @@ export default defineConfig((config) => {
 		].filter(Boolean),
 	}
 
-	return lingoCompiler.vite({
-		sourceRoot: 'app',
-		lingoDir: 'lingo',
-		sourceLocale: 'en',
-		targetLocales: ['es'],
-		rsc: false,
-		useDirective: false,
-		debug: false,
-		models: 'lingo.dev',
-	})(configWithSentry)
+	return withLingo(configWithSentry)
 })