Finish MFA v1 and refactor all tokens into separate TokenService with modified collection

backend/src/models/token.ts

@@ -1,33 +0,0 @@
-import { Schema, model } from 'mongoose';
-import { EMAIL_TOKEN_LIFETIME } from '../config';
-
-export interface IToken {
-  email: string;
-  token: string;
-  createdAt: Date;
-}
-
-const tokenSchema = new Schema<IToken>({
-  email: {
-    type: String,
-    required: true
-  },
-  token: {
-    type: String,
-    required: true
-  },
-  createdAt: {
-    type: Date,
-    default: Date.now
-  }
-});
-
-tokenSchema.index({ 
-  createdAt: 1 
-}, { 
-  expireAfterSeconds: parseInt(EMAIL_TOKEN_LIFETIME) 
-});
-
-const Token = model<IToken>('Token', tokenSchema);
-
-export default Token;