Use ordered SQLite migrations (Refs #75)

tests/unit/deployment-collections.test.ts

@@ -368,6 +368,7 @@ describe('matching a blueprint exactly', () => {
         // Recreate the older schema, which predates the history preservation trigger.
         db().exec('DROP TRIGGER preserve_deleted_server_history');
         db().exec('ALTER TABLE server_launch_collections DROP COLUMN retained_servers');
+        db().pragma('user_version = 0');
         closeDb();
         const { previewCollection } = await import('../../src/lib/server/fleet/collections.js');
         expect(previewCollection(plan.id).mode).toBe('fill');