feat: add base path for deploy

web/vite.config.ts

@@ -2,12 +2,24 @@ import adapter from '@sveltejs/adapter-static';
 import { sveltekit } from '@sveltejs/kit/vite';
 import { defineConfig } from 'vite';
 
+declare const process: { env: Record<string, string | undefined> };
+
+const rawBase = (process.env.BASE_PATH ?? '').trim();
+const base: '' | `/${string}` =
+	rawBase === '' || rawBase === '/'
+		? ''
+		: (`/${rawBase.replace(/^\/+/, '').replace(/\/+$/, '')}` as `/${string}`);
+
 export default defineConfig({
 	ssr: {
 		noExternal: ['@lucide/svelte']
 	},
 	plugins: [
 		sveltekit({
+			paths: {
+				base
+			},
+
 			compilerOptions: {
 				// Force runes mode for the project, except for libraries. Can be removed in svelte 6.
 				runes: ({ filename }) =>