feat: 添加频道管理功能，关联短剧与频道绑定逻辑

1. 新增频道模块，包含类型定义、实体、DTO、控制器和服务
2. 为短剧添加频道ID和频道名字段，支持关联频道
3. 新增短剧删除API和权限配置
4. 调整tsconfig和依赖配置，更新权限列表
5. 新增相关测试用例验证频道与短剧关联逻辑

src/channels/channel.entity.ts

@@ -0,0 +1,41 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+export type ChannelStatus = 'active' | 'disabled';
+
+@Entity('channels')
+export class Channel {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ type: 'varchar', length: 128 })
+  name: string;
+
+  @Index({ unique: true })
+  @Column({ type: 'varchar', length: 128 })
+  code: string;
+
+  @Column({ type: 'varchar', length: 512, nullable: true })
+  description?: string;
+
+  @Column({ type: 'int', default: 0 })
+  sortOrder: number;
+
+  @Column({ type: 'boolean', default: false })
+  isDefault: boolean;
+
+  @Column({ type: 'varchar', length: 32, default: 'active' })
+  status: ChannelStatus;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}