Change the structure

frontend/src/core/api/crypto/prekeys.ts

@@ -0,0 +1,14 @@
+// Placeholder for Signal Protocol pre-key management
+// Will be implemented when Signal Protocol is added
+
+export async function upload(_bundle: unknown, _token: string): Promise<void> {
+    // TODO: Implement Signal Protocol pre-key upload
+    throw new Error("Not implemented yet");
+}
+
+export async function fetch(_userId: number, _token: string): Promise<unknown> {
+    // TODO: Implement Signal Protocol pre-key fetch
+    throw new Error("Not implemented yet");
+}
+
+