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-to-json-schema/dist/cjs/parsers/nativeEnum.js

@@ -0,0 +1,20 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.parseNativeEnumDef = void 0;
+function parseNativeEnumDef(def) {
+    const object = def.values;
+    const actualKeys = Object.keys(def.values).filter((key) => {
+        return typeof object[object[key]] !== "number";
+    });
+    const actualValues = actualKeys.map((key) => object[key]);
+    const parsedTypes = Array.from(new Set(actualValues.map((values) => typeof values)));
+    return {
+        type: parsedTypes.length === 1
+            ? parsedTypes[0] === "string"
+                ? "string"
+                : "number"
+            : ["string", "number"],
+        enum: actualValues,
+    };
+}
+exports.parseNativeEnumDef = parseNativeEnumDef;