Add Instagram-style social features and Postman collections

src/modules/chat/dto/message-reaction.dto.ts

@@ -0,0 +1,9 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsEnum } from 'class-validator';
+import { ReactionType } from '../../../common/enums/reaction-type.enum';
+
+export class MessageReactionDto {
+  @ApiProperty({ enum: ReactionType })
+  @IsEnum(ReactionType)
+  reactionType!: ReactionType;
+}