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>

start.sh

@@ -18,10 +18,18 @@ if [ api/requirements.txt -nt venv/.deps_installed ] || [ ! -f venv/.deps_instal
     touch venv/.deps_installed
 fi
 
+# Stop any existing instance on port 5003
+EXISTING_PID=$(lsof -ti tcp:5003 2>/dev/null)
+if [ -n "$EXISTING_PID" ]; then
+    echo "Stopping existing process on port 5003 (PID $EXISTING_PID)..."
+    kill "$EXISTING_PID"
+    sleep 2
+fi
+
 # Oracle config
 export TNS_ADMIN="$(pwd)/api"
 export LD_LIBRARY_PATH=/opt/oracle/instantclient_21_15:$LD_LIBRARY_PATH
 
 cd api
 echo "Starting GoMag Import Manager on http://0.0.0.0:5003"
-python -m uvicorn app.main:app --host 0.0.0.0 --port 5003 --reload
+python -m uvicorn app.main:app --host 0.0.0.0 --port 5003