refactor: rename to KanzlAI-mGMT, pivot to Kanzleimanagement

New direction: law firm management (Fristen, Termine, case tracking)
instead of UPC case law search. Updated all references, Go module
path, and deployment info.

frontend/src/app/layout.tsx

@@ -13,8 +13,8 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "KanzlAI",
-  description: "AI-powered toolkit for patent litigation",
+  title: "KanzlAI-mGMT",
+  description: "Kanzleimanagement online",
 };
 
 export default function RootLayout({