feat(safety): price comparison on order detail

Add ROA price comparison to order detail modal — operators can now see
if GoMag prices match Oracle before invoicing. Eliminates the #1 risk
of invoicing with wrong prices.

Backend:
- New get_prices_for_order() in validation_service.py — batch Oracle
  query with dual-policy routing (sales/production by cont 341/345),
  PRETURI_CU_TVA handling, kit total calculation
- Extend GET /api/sync/order/{orderNumber} with per-item pret_roa and
  order-level price_check summary
- GET /api/dashboard/orders returns price_match=null (lightweight)

Frontend:
- Modal: price check badge (green/red/grey), "Pret GoMag" + "Pret ROA"
  columns, match dot per row, mismatch rows highlighted
- Dashboard: price dot column (₽) in orders table
- Mobile: inline mismatch indicator

Cache-bust: shared.js?v=16, dashboard.js?v=28

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

api/tests/e2e/test_order_detail.py

@@ -29,7 +29,7 @@ def test_order_detail_items_table_columns(page: Page, app_url: str):
     texts = headers.all_text_contents()
 
     # Current columns (may evolve — check dashboard.html for source of truth)
-    required_columns = ["SKU", "Produs", "CODMAT", "Cant.", "Pret", "Valoare"]
+    required_columns = ["SKU", "Produs", "CODMAT", "Cant.", "Pret GoMag", "Pret ROA", "Valoare"]
     for col in required_columns:
         assert col in texts, f"Column '{col}' missing from order detail items table. Found: {texts}"