chore(db): add schemas directory from upstream

- Add init.sql for database bootstrap (9.1.0)
- Add update-schema/9.2-update.sql for 9.1 → 9.2 migration
- Add bundled-schema/ with demo data templates
- Empty patch-schema/ ready for 9.2.x patches

schemas/bundled-schema/NetcafeDefaults.sql

@@ -0,0 +1,15 @@
+BEGIN;
+
+TRUNCATE public.cafebonus;
+
+INSERT INTO public.cafebonus (time_req, item_type, item_id, quantity)
+VALUES
+    (1800, 17, 0, 50),
+    (3600, 17, 0, 100),
+    (7200, 17, 0, 200),
+    (10800, 17, 0, 300),
+    (18000, 17, 0, 350),
+    (28800, 17, 0, 500),
+    (43200, 17, 0, 500);
+
+END;