feat(sqlite): refactor orders schema + dashboard period filter

Replace import_orders (insert-per-run) with orders table (one row per
order, upsert on conflict). Eliminates dedup CTE on every dashboard
query and prevents unbounded row growth at 4-500 orders/sync.

Key changes:
- orders table: PK order_number, upsert via ON CONFLICT DO UPDATE;
  COALESCE preserves id_comanda once set; times_skipped auto-increments
- sync_run_orders: lightweight junction (sync_run_id, order_number)
  replaces sync_run_id column on orders
- order_items: PK changed to (order_number, sku), INSERT OR IGNORE
- Auto-migration in init_sqlite(): import_orders → orders on first boot,
  old table renamed to import_orders_bak
- /api/dashboard/orders: period_days param (3/7/30/0=all, default 7)
- Dashboard: period selector buttons in orders card header
- start.sh: stop existing process on port 5003 before restart;
  remove --reload (broken on WSL2 /mnt/e/)
- Add invoice_service, E2E Playwright tests, Oracle package updates

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

api/database-scripts/07_alter_articole_terti_sters.sql

@@ -0,0 +1,12 @@
+-- ====================================================================
+-- 07_alter_articole_terti_sters.sql
+-- Adauga coloana "sters" in ARTICOLE_TERTI pentru soft-delete real
+-- (separat de "activ" care e toggle business)
+-- ====================================================================
+
+ALTER TABLE ARTICOLE_TERTI ADD sters NUMBER(1) DEFAULT 0;
+ALTER TABLE ARTICOLE_TERTI ADD CONSTRAINT chk_art_terti_sters CHECK (sters IN (0, 1));
+
+-- Verifica ca toate randurile existente au sters=0
+-- SELECT COUNT(*) FROM ARTICOLE_TERTI WHERE sters IS NULL;
+-- UPDATE ARTICOLE_TERTI SET sters = 0 WHERE sters IS NULL;