Add /imaging route for avatar proxy and prevent redirect loops

src/lib/imager.test.ts

@@ -13,6 +13,10 @@ describe("resolveImagerBase", () => {
 		expect(
 			resolveImagerBase("https://www.epicnabbo.nl/api/imaging/avatar"),
 		).toBe(HABBO_IMAGER_URL);
+		expect(resolveImagerBase("/imaging")).toBe(HABBO_IMAGER_URL);
+		expect(
+			resolveImagerBase("https://www.epicnabbo.nl/imaging"),
+		).toBe(HABBO_IMAGER_URL);
 	});
 
 	it("keeps a custom Habbo-compatible base", () => {