Add Bitcoin wallet admin withdraw and seed reveal API.

Expose JWT-protected withdraw-all and reveal-seed endpoints with address validation and password verification, matching Monero wallet admin behavior.

backend/src/modules/bitcoinWallet/dto/BitcoinWalletWithdrawDto.ts

@@ -0,0 +1,20 @@
+import { Transform } from 'class-transformer';
+import { IsInt, IsNotEmpty, IsString, Max, Min } from 'class-validator';
+import { IsBitcoinAddress } from '../../../validation/decorators/isBitcoinAddress';
+
+export class BitcoinWalletWithdrawDto {
+    @Transform(({ value }: { value: unknown }) => (typeof value === 'string' ? value.trim() : value))
+    @IsString()
+    @IsNotEmpty()
+    @IsBitcoinAddress()
+    destinationAddress: string;
+
+    @IsInt()
+    @Min(1)
+    @Max(100)
+    feeRateSatVbyte: number;
+
+    @IsString()
+    @IsNotEmpty()
+    password: string;
+}