fix: wallet restore height — look back ~2 days instead of current height

When generate_from_keys creates a new wallet file (first open on a
wallet-rpc instance, or after cache loss), restore_height was set to
the current daemon height. This means the wallet only scans from NOW,
missing any payments sent before the wallet was opened.

A 1440-block lookback (~2 days at ~2 min/block) ensures recent
payments are found after container restarts or wallet cache loss.

api/app/monero_service.py

@@ -393,7 +393,10 @@ class MoneroWalletService:
             )
         except (RPCError, RequestException):
             try:
-                restore_height = self._daemon_height() or 0
+                # Look back ~2 days (1440 blocks at ~2 min/block) so new wallet
+                # files can find payments that arrived before the wallet was opened.
+                daemon_height = self._daemon_height() or 0
+                restore_height = max(0, daemon_height - 1440)
                 gen_start = time.monotonic()
                 # generate_from_keys opens the wallet when successful.
                 backend.client.raw_request(