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/middleware/trailing-slash/index.js

@@ -0,0 +1,25 @@
+// src/middleware/trailing-slash/index.ts
+var trimTrailingSlash = () => {
+  return async function trimTrailingSlash2(c, next) {
+    await next();
+    if (c.res.status === 404 && (c.req.method === "GET" || c.req.method === "HEAD") && c.req.path !== "/" && c.req.path.at(-1) === "/") {
+      const url = new URL(c.req.url);
+      url.pathname = url.pathname.substring(0, url.pathname.length - 1);
+      c.res = c.redirect(url.toString(), 301);
+    }
+  };
+};
+var appendTrailingSlash = () => {
+  return async function appendTrailingSlash2(c, next) {
+    await next();
+    if (c.res.status === 404 && (c.req.method === "GET" || c.req.method === "HEAD") && c.req.path.at(-1) !== "/") {
+      const url = new URL(c.req.url);
+      url.pathname += "/";
+      c.res = c.redirect(url.toString(), 301);
+    }
+  };
+};
+export {
+  appendTrailingSlash,
+  trimTrailingSlash
+};