fix(docs): force-dynamic robots and sitemap routes

Metadata routes don't inherit the root layout's force-dynamic, so both
were prerendered at build time with the build-time DOCS_URL (usually
the fallback) baked in. Forcing dynamic rendering resolves the runtime
host, matching the pattern used in apps/docs/app/layout.tsx.

Author: smakosh

apps/docs/app/robots.ts

@@ -2,6 +2,11 @@ import { docsBaseUrl } from "@/lib/base-url";
 
 import type { MetadataRoute } from "next";
 
+// Metadata routes don't inherit the root layout's force-dynamic; without it
+// this route is prerendered at build time with the build-time DOCS_URL
+// (usually the fallback) baked in instead of the runtime value.
+export const dynamic = "force-dynamic";
+
 export default function robots(): MetadataRoute.Robots {
 	return {
 		rules: [

apps/docs/app/sitemap.ts

@@ -3,6 +3,11 @@ import { source } from "@/lib/source";
 
 import type { MetadataRoute } from "next";
 
+// Metadata routes don't inherit the root layout's force-dynamic; without it
+// this route is prerendered at build time with the build-time DOCS_URL
+// (usually the fallback) baked in instead of the runtime value.
+export const dynamic = "force-dynamic";
+
 export default function sitemap(): MetadataRoute.Sitemap {
 	// No lastModified: stamping a build-time date on every URL marks the whole
 	// sitemap as freshly changed on each deploy, which trains crawlers to