refactor login page, change routes to token-based, add service classes

src/lib/helper/getCode.ts

@@ -0,0 +1,10 @@
+export default async function get_code(case_no) {
+	let url = `/api/list/${case_no}/code`;
+	const response = await fetch(url);
+
+	if (response.status == 200) {
+		return response.text();
+	} else {
+		return -1;
+	}
+}