feat: add admin approval for IRT withdrawals

wallet/v1/internal_srv.proto

@@ -29,4 +29,6 @@ service InternalWalletSrv {
   // deactivation/locking so referenced financial history remains intact.
   rpc AdminUpsertAsset(AdminUpsertAssetReq) returns (AdminAssetMutationRes);
   rpc AdminDeactivateAsset(AdminDeactivateAssetReq) returns (base.v1.StatusRes);
+
+  rpc AdminApproveIRTWithdrawal(AdminApproveIRTWithdrawalReq) returns (base.v1.StatusRes);
 }

wallet/v1/msg.proto

@@ -227,6 +227,15 @@ message LockAssetReq {
   optional auth.v1.TFA tfa = 4; // if request is not internal
 }
 
+// Administrative approval is the only transition that may enqueue an IRT
+// withdrawal for blockchain settlement. The receipt identifies the completed
+// off-chain bank payment.
+message AdminApproveIRTWithdrawalReq {
+  uint64 withdraw_log_id = 1;
+  string bank_receipt = 2;
+  int64 actor_user_id = 3;
+}
+
 /*
    BNPL - not really but close name
 */