implement new invitation system

* fix comments on the frontend
* move jwt token service to its own module
* other fixes and updates

apps/server/src/core/auth/dto/create-user.dto.ts

@@ -9,8 +9,8 @@ import {
 
 export class CreateUserDto {
   @IsOptional()
-  @MinLength(3)
-  @MaxLength(35)
+  @MinLength(2)
+  @MaxLength(60)
   @IsString()
   name: string;