feat(settings): add GoMag API config, Oracle dropdowns, compact 2x2 layout

- Remove ID_GESTIUNE from config (unused)
- Add GoMag API settings (key, shop, days_back, limit) to SQLite — editable without restart
- sync_service reads GoMag settings from SQLite before download
- gomag_client.download_orders accepts api_key/api_shop/limit overrides
- New GET /api/settings/sectii and /api/settings/politici endpoints for Oracle dropdowns
  (nom_sectii.sectie, crm_politici_preturi.nume_lista_preturi)
- id_pol, id_sectie, transport_id_pol, discount_id_pol now use select dropdowns
- order_reader extracts discount_vat from GoMag JSON discounts[].vat
- import_service uses GoMag discount_vat as primary, settings as fallback
- settings.html redesigned to compact 2x2 grid (GoMag API | Import ROA / Transport | Discount)
- settings.js v2: loadDropdowns() sequential before loadSettings()

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

api/app/services/order_reader.py

@@ -57,6 +57,7 @@ class OrderData:
     total: float = 0.0
     delivery_cost: float = 0.0
     discount_total: float = 0.0
+    discount_vat: Optional[str] = None
     payment_name: str = ""
     delivery_name: str = ""
     source_file: str = ""
@@ -160,11 +161,14 @@ def _parse_order(order_id: str, data: dict, source_file: str) -> OrderData:
     # Parse delivery cost
     delivery_cost = float(delivery.get("total", 0) or 0) if isinstance(delivery, dict) else 0.0
 
-    # Parse discount total (sum of all discount values)
+    # Parse discount total (sum of all discount values) and VAT from first discount item
     discount_total = 0.0
+    discount_vat = None
     for d in data.get("discounts", []):
         if isinstance(d, dict):
             discount_total += float(d.get("value", 0) or 0)
+            if discount_vat is None and d.get("vat") is not None:
+                discount_vat = str(d["vat"])
 
     return OrderData(
         id=str(data.get("id", order_id)),
@@ -178,6 +182,7 @@ def _parse_order(order_id: str, data: dict, source_file: str) -> OrderData:
         total=float(data.get("total", 0) or 0),
         delivery_cost=delivery_cost,
         discount_total=discount_total,
+        discount_vat=discount_vat,
         payment_name=str(payment.get("name", "")) if isinstance(payment, dict) else "",
         delivery_name=str(delivery.get("name", "")) if isinstance(delivery, dict) else "",
         source_file=source_file