feat: integrate platform backend and application interfaces

server/migrations/0022_v1_user_mfa_enrollment.sql

@@ -0,0 +1,4 @@
+ALTER TABLE IF EXISTS mfa_challenges
+  ADD COLUMN IF NOT EXISTS purpose TEXT NOT NULL DEFAULT 'login',
+  ADD COLUMN IF NOT EXISTS pending_secret_encrypted TEXT,
+  ADD COLUMN IF NOT EXISTS pending_recovery_code_hashes JSONB NOT NULL DEFAULT '[]'::jsonb;