normalize project structure: src/client + src/server + src/shared, standardize biome to lineWidth 80

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vite.config.ts

@@ -7,7 +7,9 @@ import { defineConfig } from "vite"
 import { VitePWA } from "vite-plugin-pwa"
 
 const pkg = JSON.parse(readFileSync("./package.json", "utf-8"))
-const gitCount = execSync("git rev-list --count HEAD", { encoding: "utf-8" }).trim()
+const gitCount = execSync("git rev-list --count HEAD", {
+	encoding: "utf-8",
+}).trim()
 
 export default defineConfig({
 	base: "/whattoplay/",
@@ -15,7 +17,10 @@ export default defineConfig({
 		__APP_VERSION__: JSON.stringify(`${pkg.version}+${gitCount}`),
 	},
 	plugins: [
-		TanStackRouterVite(),
+		TanStackRouterVite({
+			routesDirectory: "src/client/routes",
+			generatedRouteTree: "src/client/routeTree.gen.ts",
+		}),
 		react(),
 		tailwindcss(),
 		VitePWA({
@@ -40,7 +45,7 @@ export default defineConfig({
 	],
 	resolve: {
 		alias: {
-			"@": "/src",
+			"@": "/src/client",
 		},
 	},
 	server: {