feat(mfa): add schema for recovery codes factor

migrations/20260824000000_add_recovery_codes_factor_type.up.sql

@@ -0,0 +1,6 @@
+/* auth_migration: 20260824000000 */
+do $$ begin
+    alter type {{ index .Options "Namespace" }}.factor_type add value 'recovery_code';
+exception
+    when duplicate_object then null;
+end $$;

migrations/20260824000001_add_recovery_codes_tables.up.sql

@@ -0,0 +1,23 @@
+/* auth_migration: 20260824000001 */
+create table if not exists {{ index .Options "Namespace" }}.mfa_recovery_code_sets (
+    id uuid primary key,
+    user_id uuid not null unique references {{ index .Options "Namespace" }}.users (id) on delete cascade,
+    mfa_factor_id uuid not null unique references {{ index .Options "Namespace" }}.mfa_factors (id) on delete cascade,
+    failed_verification_count integer not null default 0 check (failed_verification_count >= 0),
+    verification_locked_until timestamptz,
+    created_at timestamptz not null default now(),
+    updated_at timestamptz not null default now()
+);
+
+/* auth_migration: 20260824000001 */
+create table if not exists {{ index .Options "Namespace" }}.mfa_recovery_codes (
+    id uuid primary key,
+    mfa_recovery_code_set_id uuid not null references {{ index .Options "Namespace" }}.mfa_recovery_code_sets (id) on delete cascade,
+    code_hash text not null,
+    consumed_at timestamptz,
+    created_at timestamptz not null default now()
+);
+
+/* auth_migration: 20260824000001 */
+create index if not exists mfa_recovery_codes_set_id_idx
+    on {{ index .Options "Namespace" }}.mfa_recovery_codes (mfa_recovery_code_set_id);