feat(API-11): Route API calls through AgilitonAPI gateway

Add gateway-first pattern: when AGILITON_API_KEY is set, route all
external API calls through the gateway with X-API-Key auth. Falls back
to direct API access when gateway is unavailable.

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

node_modules/hono/dist/adapter/bun/ssg.js

@@ -0,0 +1,17 @@
+// src/adapter/bun/ssg.ts
+import { toSSG as baseToSSG } from "../../helper/ssg/index.js";
+var { write } = Bun;
+var bunFileSystemModule = {
+  writeFile: async (path, data) => {
+    await write(path, data);
+  },
+  mkdir: async () => {
+  }
+};
+var toSSG = async (app, options) => {
+  return baseToSSG(app, bunFileSystemModule, options);
+};
+export {
+  bunFileSystemModule,
+  toSSG
+};