refactor: organize backend by business responsibility

src/modules/investments/tbank-connection/tbank-connection.dto.ts

@@ -0,0 +1,18 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty, IsString, MaxLength } from 'class-validator';
+
+export class PutTbankConnectionDto {
+  @ApiProperty({ writeOnly: true })
+  @IsString()
+  @IsNotEmpty()
+  @MaxLength(4096)
+  declare token: string;
+}
+
+export class TbankConnectionStatusDto {
+  @ApiProperty()
+  declare connected: boolean;
+
+  @ApiProperty({ type: String, nullable: true, format: 'date-time' })
+  declare connectedAt: string | null;
+}