feat(users): add boolean fields for online status and read receipts

- Added `showOnlineStatus` and `showReadReceipts` fields to `UpdateUserDto` with validation.

backend/src/users/dto/update-user.dto.ts

@@ -1,4 +1,4 @@
-import { IsOptional, IsString, MaxLength } from "class-validator";
+import { IsBoolean, IsOptional, IsString, MaxLength } from "class-validator";
 
 export class UpdateUserDto {
 	@IsOptional()
@@ -22,4 +22,12 @@ export class UpdateUserDto {
 	@IsOptional()
 	@IsString()
 	role?: string;
+
+	@IsOptional()
+	@IsBoolean()
+	showOnlineStatus?: boolean;
+
+	@IsOptional()
+	@IsBoolean()
+	showReadReceipts?: boolean;
 }