feat(identity): change username format to '榴莲女皇x号'

- Replace random username generation with fixed format
- Username now uses accountSequence: '榴莲女皇{序列号}号'
- Keep random durian-themed SVG avatar generation

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

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

backend/services/identity-service/src/application/commands/auto-create-account/auto-create-account.handler.ts

@@ -8,7 +8,7 @@ import { TokenService } from '@/application/services/token.service';
 import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
 import { ApplicationError } from '@/shared/exceptions/domain.exception';
 import { AutoCreateAccountResult } from '../index';
-import { generateRandomIdentity } from '@/shared/utils';
+import { generateIdentity } from '@/shared/utils';
 
 @Injectable()
 export class AutoCreateAccountHandler {
@@ -43,8 +43,8 @@ export class AutoCreateAccountHandler {
     // 3. 生成用户序列号
     const accountSequence = await this.sequenceGenerator.generateNextUserSequence();
 
-    // 4. 生成随机用户名和头像
-    const identity = generateRandomIdentity();
+    // 4. 生成用户名和头像
+    const identity = generateIdentity(accountSequence.value);
 
     // 5. 构建设备名称，保存完整的设备信息 JSON
     let deviceNameStr = '未命名设备';

backend/services/identity-service/src/application/services/user-application.service.ts

@@ -20,7 +20,7 @@ import { MpcWalletService } from '@/infrastructure/external/mpc';
 import { BlockchainWalletHandler } from '../event-handlers/blockchain-wallet.handler';
 import { MpcKeygenCompletedHandler } from '../event-handlers/mpc-keygen-completed.handler';
 import { ApplicationError } from '@/shared/exceptions/domain.exception';
-import { generateRandomIdentity } from '@/shared/utils';
+import { generateIdentity } from '@/shared/utils';
 import { MpcKeygenRequestedEvent } from '@/domain/events';
 import {
   AutoCreateAccountCommand, RecoverByMnemonicCommand, RecoverByPhoneCommand,
@@ -88,8 +88,8 @@ export class UserApplicationService {
     // 3. 生成用户序列号
     const accountSequence = await this.sequenceGenerator.generateNextUserSequence();
 
-    // 4. 生成随机用户名和头像
-    const identity = generateRandomIdentity();
+    // 4. 生成用户名和头像
+    const identity = generateIdentity(accountSequence.value);
 
     // 5. 构建设备名称字符串
     let deviceNameStr = '未命名设备';

backend/services/identity-service/src/shared/utils/random-identity.util.ts

@@ -1,27 +1,10 @@
 /**
- * 随机用户名和头像生成器
+ * 用户名和头像生成器
  */
 
-// 形容词词库 (水果/美食主题)
-const ADJECTIVES = [
-  '快乐', '阳光', '活泼', '可爱', '勇敢', '聪明', '温暖', '甜蜜',
-  '闪亮', '酷炫', '神秘', '优雅', '热情', '淘气', '呆萌', '霸气',
-  '清新', '软糯', '香甜', '金色', '紫色', '粉色', '蓝色', '绿色',
-];
-
-// 名词词库 (水果主题 - 榴莲相关)
-const NOUNS = [
-  '榴莲', '芒果', '椰子', '菠萝', '龙眼', '荔枝', '山竹', '木瓜',
-  '百香果', '火龙果', '杨桃', '莲雾', '番石榴', '释迦', '红毛丹',
-  '勇士', '战士', '骑士', '猎手', '侠客', '英雄', '达人', '玩家',
-];
-
-// 生成随机用户名: 形容词 + 名词 + 随机数字
-export function generateRandomUsername(): string {
-  const adjective = ADJECTIVES[Math.floor(Math.random() * ADJECTIVES.length)];
-  const noun = NOUNS[Math.floor(Math.random() * NOUNS.length)];
-  const number = Math.floor(Math.random() * 90000) + 10000; // 5位数字
-  return `${adjective}${noun}_${number}`;
+// 生成用户名: 榴莲女皇x号
+export function generateUsername(accountSequence: number): string {
+  return `榴莲女皇${accountSequence}号`;
 }
 
 // 预定义的柔和配色方案
@@ -148,11 +131,12 @@ export function generateRandomAvatarSvg(): string {
 }
 
 /**
- * 生成完整的随机身份
+ * 生成用户身份
+ * @param accountSequence 用户序列号
  */
-export function generateRandomIdentity(): { username: string; avatarSvg: string } {
+export function generateIdentity(accountSequence: number): { username: string; avatarSvg: string } {
   return {
-    username: generateRandomUsername(),
+    username: generateUsername(accountSequence),
     avatarSvg: generateRandomAvatarSvg(),
   };
 }