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/esm/parsers/set.js

@@ -0,0 +1,20 @@
+import { setResponseValueAndErrors } from "../errorMessages.js";
+import { parseDef } from "../parseDef.js";
+export function parseSetDef(def, refs) {
+    const items = parseDef(def.valueType._def, {
+        ...refs,
+        currentPath: [...refs.currentPath, "items"],
+    });
+    const schema = {
+        type: "array",
+        uniqueItems: true,
+        items,
+    };
+    if (def.minSize) {
+        setResponseValueAndErrors(schema, "minItems", def.minSize.value, def.minSize.message, refs);
+    }
+    if (def.maxSize) {
+        setResponseValueAndErrors(schema, "maxItems", def.maxSize.value, def.maxSize.message, refs);
+    }
+    return schema;
+}