Serve avatars from site's own /imaging endpoint instead of habbo.com

- Change default public imager URL from habbo.com to /imaging
- /imaging and /api/imaging/avatar now proxy from upstream (habbo.com) instead of redirecting
- Add resolveUpstreamBase() to separate public URL from upstream URL
- Update admin settings default and description

src/lib/imager.ts

@@ -1,38 +1,47 @@
 /**
- * Habbo avatar imager helpers.
+ * Avatar imager helpers.
  *
- * Images are loaded directly from Habbo's public imager. The old self-hosted
- * `/api/imaging/avatar` proxy fails in production (Habbo blocks server-side
- * fetches), so the browser always hits Habbo.com instead.
+ * The public-facing imager URL resolves to the site's own `/imaging` endpoint
+ * by default. That endpoint proxies the image from the configured upstream
+ * (defaults to Habbo's public imager).
  */
 
 export type { AvatarOptions } from "@/types/admin";
 
 import type { AvatarOptions } from "@/types/admin";
 
-/** Official Habbo avatar imaging endpoint. */
-export const HABBO_IMAGER_URL =
-	"https://www.habbo.com/habbo-imaging/avatarimage";
+/** Default public imager endpoint (relative — served by the site itself). */
+export const DEFAULT_IMAGER_URL = "/imaging";
 
 /**
- * Resolve a usable imager base URL.
- * Rejects the broken self-hosted proxy if it was stored in settings.
+ * Resolve the public-facing imager base URL.
+ * Rejects the broken self-hosted proxy route if stored in settings.
  */
 export function resolveImagerBase(configured?: string | null): string {
 	const fromEnv = process.env.NEXT_PUBLIC_IMAGER_URL?.trim();
-	if (fromEnv && !fromEnv.includes("/api/imaging/avatar") && !fromEnv.includes("/imaging")) {
+	if (fromEnv && !fromEnv.includes("/api/imaging/avatar")) {
 		return fromEnv.replace(/\/+$/, "");
 	}
 
 	const v = (configured ?? "").trim();
-	if (!v || v.includes("/api/imaging/avatar") || v.includes("/imaging")) {
-		return HABBO_IMAGER_URL;
+	if (!v || v.includes("/api/imaging/avatar")) {
+		return DEFAULT_IMAGER_URL;
 	}
 	return v.replace(/\/+$/, "");
 }
 
 /**
- * Build an avatar image URL (Habbo imager by default).
+ * Resolve the upstream URL used by the proxy endpoint.
+ * Falls back to Habbo's public imager when nothing else is configured.
+ */
+export function resolveUpstreamBase(): string {
+	const fromEnv = process.env.IMAGING_UPSTREAM_URL?.trim();
+	if (fromEnv) return fromEnv.replace(/\/+$/, "");
+	return "https://www.habbo.com/habbo-imaging/avatarimage";
+}
+
+/**
+ * Build an avatar image URL (site's own `/imaging` endpoint by default).
  *
  * @example
  * getAvatarUrl('hr-893-45.hd-180-1.ch-210-66.lg-270-82')