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/zod/v4/locales/kh.cjs

@@ -0,0 +1,12 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = default_1;
+const km_js_1 = __importDefault(require("./km.cjs"));
+/** @deprecated Use `km` instead. */
+function default_1() {
+    return (0, km_js_1.default)();
+}
+module.exports = exports.default;