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/node-server/dist/serve-static.d.mts

@@ -0,0 +1,17 @@
+import { Env, Context, MiddlewareHandler } from 'hono';
+
+type ServeStaticOptions<E extends Env = Env> = {
+    /**
+     * Root path, relative to current working directory from which the app was started. Absolute paths are not supported.
+     */
+    root?: string;
+    path?: string;
+    index?: string;
+    precompressed?: boolean;
+    rewriteRequestPath?: (path: string, c: Context<E>) => string;
+    onFound?: (path: string, c: Context<E>) => void | Promise<void>;
+    onNotFound?: (path: string, c: Context<E>) => void | Promise<void>;
+};
+declare const serveStatic: <E extends Env = any>(options?: ServeStaticOptions<E>) => MiddlewareHandler<E>;
+
+export { ServeStaticOptions, serveStatic };