修复导入用户丢失问题

src/lib/db.ts

@@ -132,11 +132,7 @@ export class DbManager {
     return favorite !== null;
   }
 
-  // ---------- 用户相关（旧版本，保持兼容） ----------
-  async registerUser(userName: string, password: string): Promise<void> {
-    await this.storage.registerUser(userName, password);
-  }
-
+ 
   async verifyUser(userName: string, password: string): Promise<boolean> {
     return this.storage.verifyUser(userName, password);
   }

src/lib/redis-base.db.ts

@@ -492,11 +492,6 @@ export abstract class BaseRedisStorage implements IStorage {
     return `u:${user}:pwd`;
   }
 
-  async registerUser(userName: string, password: string): Promise<void> {
-    // 简单存储明文密码，生产环境应加密
-    await this.withRetry(() => this.client.set(this.userPwdKey(userName), password));
-  }
-
   async verifyUser(userName: string, password: string): Promise<boolean> {
     const stored = await this.withRetry(() =>
       this.client.get(this.userPwdKey(userName))

src/lib/types.ts

@@ -53,7 +53,6 @@ export interface IStorage {
   migrateFavorites(userName: string): Promise<void>;
 
   // 用户相关
-  registerUser(userName: string, password: string): Promise<void>;
   verifyUser(userName: string, password: string): Promise<boolean>;
   // 检查用户是否存在（无需密码）
   checkUserExist(userName: string): Promise<boolean>;

src/lib/upstash.db.ts

@@ -393,11 +393,6 @@ export class UpstashRedisStorage implements IStorage {
     return `u:${user}:pwd`;
   }
 
-  async registerUser(userName: string, password: string): Promise<void> {
-    // 简单存储明文密码，生产环境应加密
-    await withRetry(() => this.client.set(this.userPwdKey(userName), password));
-  }
-
   async verifyUser(userName: string, password: string): Promise<boolean> {
     const stored = await withRetry(() =>
       this.client.get(this.userPwdKey(userName))