refactor: 调整userSession服务及实体至Auth模块下

apps/backend/src/auth/entity/user-session.entity.ts

@@ -0,0 +1,27 @@
+import {
+  Column,
+  CreateDateColumn,
+  DeleteDateColumn,
+  Entity,
+  Index,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+
+@Entity()
+@Index(['sessionId', 'userId'])
+export class UserSession {
+  @PrimaryGeneratedColumn('uuid')
+  sessionId: string;
+
+  @Column({ length: 36 })
+  userId: string;
+
+  @Column({ nullable: true })
+  disabledReason?: string;
+
+  @CreateDateColumn({ precision: 3 })
+  createdAt: Date;
+
+  @DeleteDateColumn({ nullable: true, precision: 3 })
+  deletedAt: Date;
+}