Fix: widen passport columns to TEXT for encrypted values

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/migrations/013_widen_passport_columns.sql

@@ -0,0 +1,11 @@
+-- Migration 013: расширяем passport_series/number до TEXT
+-- Зашифрованное значение (~110 символов) не влезает в VARCHAR(20)
+
+ALTER TABLE guests
+  ALTER COLUMN passport        TYPE TEXT,
+  ALTER COLUMN passport_series TYPE TEXT,
+  ALTER COLUMN passport_number TYPE TEXT;
+
+ALTER TABLE booking_guests
+  ALTER COLUMN passport_series TYPE TEXT,
+  ALTER COLUMN passport_number TYPE TEXT;