feat: implement Radicale CardDAV sync utility and update contact handling for asynchronous sync

src/app/api/contacts/[id]/route.js

@@ -6,6 +6,7 @@ import {
 	hardDeleteContact,
 } from "@/lib/queries/contacts";
 import { withAuth } from "@/lib/middleware/auth";
+import { syncContactAsync, deleteContactAsync } from "@/lib/radicale-sync";
 
 // GET: Get contact by ID
 async function getContactHandler(req, { params }) {
@@ -62,6 +63,9 @@ async function updateContactHandler(req, { params }) {
 			);
 		}
 
+		// Sync to Radicale asynchronously (non-blocking)
+		syncContactAsync(contact);
+
 		return NextResponse.json(contact);
 	} catch (error) {
 		console.error("Error updating contact:", error);
@@ -82,9 +86,13 @@ async function deleteContactHandler(req, { params }) {
 		if (hard) {
 			// Hard delete - permanently remove
 			hardDeleteContact(contactId);
+			// Delete from Radicale asynchronously
+			deleteContactAsync(contactId);
 		} else {
 			// Soft delete - set is_active to 0
 			deleteContact(contactId);
+			// Delete from Radicale asynchronously
+			deleteContactAsync(contactId);
 		}
 
 		return NextResponse.json({ message: "Contact deleted successfully" });

src/app/api/contacts/route.js

@@ -5,6 +5,7 @@ import {
 	getContactStats,
 } from "@/lib/queries/contacts";
 import { withAuth } from "@/lib/middleware/auth";
+import { syncContactAsync } from "@/lib/radicale-sync";
 
 // GET: Get all contacts with optional filters
 async function getContactsHandler(req) {
@@ -58,6 +59,10 @@ async function createContactHandler(req) {
 		}
 
 		const contact = createContact(data);
+		
+		// Sync to Radicale asynchronously (non-blocking)
+		syncContactAsync(contact);
+		
 		return NextResponse.json(contact, { status: 201 });
 	} catch (error) {
 		console.error("Error creating contact:", error);