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/app/admin/settings/cms-settings-config.ts

@@ -91,11 +91,11 @@ export const SETTINGS_GROUPS: SettingsGroup[] = [
 		fields: [
 			{
 				key: "habbo_imaging_url",
-				label: "Habbo imager URL",
+				label: "Public imager URL",
 				type: "url",
-				defaultValue: "https://www.habbo.com/habbo-imaging/avatarimage",
+				defaultValue: "/imaging",
 				description:
-					"Public Habbo avatar endpoint used in the browser. Do not point this at /api/imaging/avatar.",
+					"Public avatar endpoint (relative or absolute). Leave as /imaging to serve from this site.",
 			},
 			{
 				key: "imaging_use_habbo_fallback",