Add Optional 2FA Support (#61)

* Add TOTP MFA Support

* Add Passkey MFA Support

It's not impossible I missed some minor cleanup, but most things make sense and there isn't a lot of obvious duplication anymore.

---------

Co-authored-by: Bruno Bernardino <me@brunobernardino.com>

lib/config.ts

@@ -11,6 +11,7 @@ export class AppConfig {
         allowSignups: false,
         enableEmailVerification: false,
         enableForeverSignup: true,
+        enableMultiFactor: false,
         allowedCookieDomains: [],
         skipCookieDomainSecurity: false,
       },
@@ -193,6 +194,12 @@ export class AppConfig {
     return this.config.auth.enableForeverSignup;
   }
 
+  static async isMultiFactorAuthEnabled(): Promise<boolean> {
+    await this.loadConfig();
+
+    return this.config.auth.enableMultiFactor;
+  }
+
   static async getFilesRootPath(): Promise<string> {
     await this.loadConfig();