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/app/services/invoice_service.py

@@ -0,0 +1,43 @@
+import logging
+from .. import database
+
+logger = logging.getLogger(__name__)
+
+
+def check_invoices_for_orders(id_comanda_list: list) -> dict:
+    """Check which orders have been invoiced in Oracle (vanzari table).
+    Returns {id_comanda: {facturat, numar_act, serie_act, total_fara_tva, total_tva, total_cu_tva}}
+    """
+    if not id_comanda_list or database.pool is None:
+        return {}
+
+    result = {}
+    conn = database.get_oracle_connection()
+    try:
+        with conn.cursor() as cur:
+            for i in range(0, len(id_comanda_list), 500):
+                batch = id_comanda_list[i:i+500]
+                placeholders = ",".join([f":c{j}" for j in range(len(batch))])
+                params = {f"c{j}": cid for j, cid in enumerate(batch)}
+
+                cur.execute(f"""
+                    SELECT id_comanda, numar_act, serie_act,
+                           total_fara_tva, total_tva, total_cu_tva
+                    FROM vanzari
+                    WHERE id_comanda IN ({placeholders}) AND sters = 0
+                """, params)
+                for row in cur:
+                    result[row[0]] = {
+                        "facturat": True,
+                        "numar_act": row[1],
+                        "serie_act": row[2],
+                        "total_fara_tva": float(row[3]) if row[3] else 0,
+                        "total_tva": float(row[4]) if row[4] else 0,
+                        "total_cu_tva": float(row[5]) if row[5] else 0,
+                    }
+    except Exception as e:
+        logger.warning(f"Invoice check failed (table may not exist): {e}")
+    finally:
+        database.pool.release(conn)
+
+    return result