fix(transfer): pass sessionId and participants to executeSign

- Add signSessionId state to store the session ID from createSignSession
- Add ParticipantInfo interface and participants field to ShareInfo
- Build participants list from share data for executeSign call
- Fix "Party not found in participants list" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/mpc-system/services/service-party-app/src/pages/Transfer.tsx

@@ -16,12 +16,18 @@ import {
 } from '../utils/transaction';
 import { deriveEvmAddress, formatAddress } from '../utils/address';
 
+interface ParticipantInfo {
+  partyId: string;
+  name?: string;
+}
+
 interface ShareInfo {
   id: string;
   walletName: string;
   publicKey: string;
   sessionId: string;
   threshold: { t: number; n: number };
+  participants?: ParticipantInfo[];
   evmAddress?: string;
   balance?: string;
 }
@@ -52,6 +58,7 @@ export default function Transfer() {
 
   // 签名会话
   const [inviteCode, setInviteCode] = useState('');
+  const [signSessionId, setSignSessionId] = useState('');
 
   // 错误信息
   const [error, setError] = useState('');
@@ -206,6 +213,7 @@ export default function Transfer() {
         }
 
         setInviteCode(result.inviteCode || '');
+        setSignSessionId(result.sessionId || '');
         setTxHash(messageHash);
 
         // 显示邀请码，等待用户通知其他参与方
@@ -219,17 +227,23 @@ export default function Transfer() {
 
   // 执行签名并广播
   const handleExecuteAndBroadcast = async () => {
-    if (!txParams || !share || !txHash) return;
+    if (!txParams || !share || !txHash || !signSessionId) return;
 
     try {
+      // 构建 participants 列表
+      const participants = (share.participants || []).map((p, index) => ({
+        partyId: p.partyId,
+        partyIndex: index,
+      }));
+
       // 执行 TSS 签名
       if (window.electronAPI) {
         const signResult = await window.electronAPI.grpc.executeSign({
-          sessionId: '', // 将从邀请码获取
+          sessionId: signSessionId,
           shareId: share.id,
           password,
           messageHash: txHash.slice(2),
-          participants: [], // 将从会话获取
+          participants,
           threshold: share.threshold,
         });