fix(geplante-nachrichten): add /api prefix to all API paths, fix subscribe room token, unmask empty bot credentials, add Einzelnachrichten tab

backend/src/services/scheduledMessages.service.ts

@@ -521,7 +521,37 @@ async function sendVehicleEvent(vehicleId: string): Promise<void> {
   }
 }
 
-// ── One-Time Messages ─────────────────────────────────────────────────────────
+// ── Bot Room ──────────────────────────────────────────────────────────────────
+
+/**
+ * Finds or creates a 1:1 Nextcloud Talk room between the bot and the given user.
+ * Returns the room token, null if bot isn't configured, or 'not_connected' if the
+ * user hasn't linked their Nextcloud account.
+ */
+async function getOrCreateBotRoom(userId: string): Promise<string | null | 'not_connected'> {
+  const creds = await getBotCredentials();
+  if (!creds) return null;
+
+  // Look up the user's Nextcloud login name
+  const userResult = await pool.query(
+    'SELECT nextcloud_login_name FROM users WHERE id = $1',
+    [userId],
+  );
+  const nextcloudLoginName = userResult.rows[0]?.nextcloud_login_name as string | null;
+  if (!nextcloudLoginName) return 'not_connected';
+
+  // Use createRoom(type=1) — Nextcloud returns existing 1:1 if it already exists
+  const { token } = await nextcloudService.createRoom(
+    1,
+    nextcloudLoginName,
+    undefined,
+    creds.username,
+    creds.appPassword,
+  );
+  return token;
+}
+
+
 
 interface OneTimeMessage {
   id: string;
@@ -598,6 +628,7 @@ const scheduledMessagesService = {
   getSubscriptionsForUser,
   buildAndSend,
   sendVehicleEvent,
+  getOrCreateBotRoom,
   getOneTimeMessages,
   createOneTimeMessage,
   deleteOneTimeMessage,