Refactor(frontend): Refactor frontend using Lit

Refactor(database): use gorm+sqlite instead of bbolt
Feat: Add delete short link functionality
Fix: Load correct configuration template during meta config conversion

server/frontend/src/utils.ts

@@ -0,0 +1,15 @@
+export function base64EncodeUnicode(str: string) {
+  const bytes = new TextEncoder().encode(str);
+  let binary = "";
+  bytes.forEach((b) => (binary += String.fromCharCode(b)));
+  return btoa(binary);
+}
+
+export function base64decodeUnicode(str: string) {
+  const binaryString = atob(str);
+  const bytes = new Uint8Array(binaryString.length);
+  for (let i = 0; i < binaryString.length; i++) {
+    bytes[i] = binaryString.charCodeAt(i);
+  }
+  return new TextDecoder().decode(bytes);
+}