fix: renumber migrations 0042-0045 after rebase onto main

Main added 0041_app_settings, so branch migrations shift up by one.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/backend/src/db/migrations/0045_registers-reports.sql

@@ -0,0 +1,12 @@
+-- Named registers for POS terminals
+CREATE TABLE IF NOT EXISTS register (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  location_id UUID NOT NULL REFERENCES location(id),
+  name VARCHAR(100) NOT NULL,
+  is_active BOOLEAN NOT NULL DEFAULT true,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Link drawer sessions to registers
+ALTER TABLE drawer_session ADD COLUMN IF NOT EXISTS register_id UUID REFERENCES register(id);