feat: add settlement dismissal and cancellation RPCs

wallet/v1/internal_srv.proto

@@ -31,6 +31,10 @@ service InternalWalletSrv {
   rpc AdminDeactivateAsset(AdminDeactivateAssetReq) returns (base.v1.StatusRes);
 
   rpc AdminApproveIRTWithdrawal(AdminApproveIRTWithdrawalReq) returns (base.v1.StatusRes);
+  // Cancels an unapproved request and releases its reservation atomically.
+  rpc AdminCancelIRTWithdrawal(AdminCancelIRTWithdrawalReq) returns (base.v1.StatusRes);
+  // Cancel only an undecided ICO agreement, atomically against user acceptance.
+  rpc AdminCancelICOAgreement(AdminCancelICOAgreementReq) returns (base.v1.StatusRes);
 
   // Bank statement receipts are checked and confirmed through the wallet owner.
   // Confirmation is idempotent by bank_transaction_number.

wallet/v1/msg.proto

@@ -898,3 +898,15 @@ message AdminDeactivateAssetReq {
 message AdminAssetMutationRes {
   int64 asset_id = 1;
 }
+
+// Administrative cancellation never changes a decided agreement or moves funds.
+message AdminCancelICOAgreementReq {
+  uint64 agreement_id = 1;
+  int64 actor_user_id = 2;
+}
+
+message AdminCancelIRTWithdrawalReq {
+  uint64 withdraw_log_id = 1;
+  string reason = 2;
+  int64 actor_user_id = 3;
+}