feat: First iteration, multi themes, I18N

public/js/services/data.js

@@ -0,0 +1,24 @@
+// Loads the static game data and the lists of installed themes / languages.
+
+import { buildContext } from '../engine/context.js';
+
+async function getJson(url) {
+  const response = await fetch(url);
+  if (!response.ok) throw new Error(`${url}: HTTP ${response.status}`);
+  return response.json();
+}
+
+export async function loadGameContext() {
+  const [rules, generators, upgrades] = await Promise.all([
+    getJson('data/rules.json'),
+    getJson('data/generators.json'),
+    getJson('data/upgrades.json'),
+  ]);
+  return buildContext({ rules, generators, upgrades });
+}
+
+/** [{ id, order, assets, locales }] discovered from public/themes/ by the server. */
+export const fetchThemes = () => getJson('api/themes');
+
+/** [{ code, name }] discovered from public/locales/ by the server. */
+export const fetchLocales = () => getJson('api/locales');