feat(framework): config 生产用 HttpConfigFetcher(全局 fetch)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/assets/framework/config/remote-config-fetcher.ts

@@ -0,0 +1,15 @@
+import type { ConfigFetcher, RemoteConfig } from './remote-config.ts';
+import { ConfigParseError } from './remote-config.ts';
+
+/** 生产用 ConfigFetcher：全局 fetch 抓取远程配置 txt 并 JSON.parse。 */
+export class HttpConfigFetcher implements ConfigFetcher {
+  async fetch(url: string): Promise<RemoteConfig> {
+    const resp = await fetch(url, { method: 'GET' });
+    const text = await resp.text();
+    try {
+      return JSON.parse(text) as RemoteConfig;
+    } catch {
+      throw new ConfigParseError(`远程配置 JSON 解析失败: ${url}`);
+    }
+  }
+}