add fee priority to Monero wallet withdrawal API.

Pass sweep_all priority through the withdraw endpoint so admins can choose transaction fee speed.

backend/src/types/moneroWallet/MoneroWithdrawPriority.ts

@@ -0,0 +1,15 @@
+/**
+ * Maps to monero-wallet-rpc `sweep_all` / `transfer` priority (0–4).
+ *
+ * Absolute fee multipliers (fee algorithm 4, current mainnet) are 1, 5, 25, 1000 for priorities 1–4.
+ * Official GUI labels are scaled relative to Normal (priority 2): 0.2×, 1×, 5×, 200×.
+ *
+ * @see https://www.getmonero.org/resources/developer-guides/wallet-rpc.html#sweep_all
+ */
+export enum MoneroWithdrawPriority {
+    Automatic = 0,
+    Slow = 1,
+    Normal = 2,
+    Fast = 3,
+    Fastest = 4
+}