add comment and category

src/modules/content/entities/CategoryEntity.ts

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+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity('content_category')
+export class CategoryEntity {
+    @PrimaryColumn({ type: 'varchar', generated: 'uuid', length: 36 })
+    id: string;
+
+    @Column({ comment: '分类名称', unique: true })
+    name: string;
+
+    @Column({ comment: '分类排序', default: 0 })
+    customOrder: number;
+}

src/modules/content/entities/comment.entity.ts

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+import { Column, CreateDateColumn, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity('content_comment')
+export class CommentEntity {
+    @PrimaryColumn({ type: 'varchar', length: 36, generated: 'uuid' })
+    id: string;
+
+    @Column({ comment: '评论内容', type: 'text' })
+    body: string;
+
+    @CreateDateColumn({ comment: '创建时间' })
+    createdAt: Date;
+}

src/modules/content/entities/tag.entity.ts

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+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity('content_tag')
+export class TagEntity {
+    @PrimaryColumn({ type: 'varchar', generated: 'uuid', length: 36 })
+    id: string;
+
+    @Column({ comment: '标签名称', unique: true })
+    name: string;
+
+    @Column({ comment: '标签描述', nullable: true })
+    desc?: string;
+}