fix: resolve TypeScript and lint issues

- Fix proxy routes to use resolveImagerBase instead of removed resolveUpstreamBase
- Fix avatarImageUrl type signature to use AvatarOptions
- Run biome formatter

src/lib/format.ts

@@ -1,16 +1,9 @@
 import { getNewFormatFigure } from "@/lib/figure-convert";
 import { getAvatarUrl } from "@/lib/imager";
+import type { AvatarOptions } from "@/types/admin";
 
 /** Build a Habbo avatar-imager URL for a figure string. */
-export function avatarImageUrl(
-	look: string,
-	opts: {
-		size?: "s" | "m" | "l";
-		headOnly?: boolean;
-		direction?: number;
-		headDirection?: number;
-	} = {},
-): string {
+export function avatarImageUrl(look: string, opts: AvatarOptions = {}): string {
 	const figure = getNewFormatFigure(look);
 	return getAvatarUrl(figure, opts);
 }