feat: resolve auth identity migration reports

backend/migrations/114_auth_identity_migration_report_resolution.sql

@@ -0,0 +1,11 @@
+ALTER TABLE auth_identity_migration_reports
+    ADD COLUMN IF NOT EXISTS resolved_at TIMESTAMPTZ NULL;
+
+ALTER TABLE auth_identity_migration_reports
+    ADD COLUMN IF NOT EXISTS resolved_by_user_id BIGINT NULL;
+
+ALTER TABLE auth_identity_migration_reports
+    ADD COLUMN IF NOT EXISTS resolution_note TEXT NOT NULL DEFAULT '';
+
+CREATE INDEX IF NOT EXISTS idx_auth_identity_migration_reports_resolved_at
+    ON auth_identity_migration_reports (resolved_at);