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/gomag_client.py

@@ -16,19 +16,27 @@ logger = logging.getLogger(__name__)
 async def download_orders(
     json_dir: str,
     days_back: int = None,
+    api_key: str = None,
+    api_shop: str = None,
+    limit: int = None,
     log_fn: Callable[[str], None] = None,
 ) -> dict:
     """Download orders from GoMag API and save as JSON files.
 
     Returns dict with keys: pages, total, files (list of saved file paths).
     If API keys are not configured, returns immediately with empty result.
+    Optional api_key, api_shop, limit override config.settings values.
     """
     def _log(msg: str):
         logger.info(msg)
         if log_fn:
             log_fn(msg)
 
-    if not settings.GOMAG_API_KEY or not settings.GOMAG_API_SHOP:
+    effective_key = api_key or settings.GOMAG_API_KEY
+    effective_shop = api_shop or settings.GOMAG_API_SHOP
+    effective_limit = limit or settings.GOMAG_LIMIT
+
+    if not effective_key or not effective_shop:
         _log("GoMag API keys neconfigurați, skip download")
         return {"pages": 0, "total": 0, "files": []}
 
@@ -40,8 +48,8 @@ async def download_orders(
     out_dir.mkdir(parents=True, exist_ok=True)
 
     headers = {
-        "Apikey": settings.GOMAG_API_KEY,
-        "ApiShop": settings.GOMAG_API_SHOP,
+        "Apikey": effective_key,
+        "ApiShop": effective_shop,
         "User-Agent": "Mozilla/5.0",
         "Content-Type": "application/json",
     }
@@ -57,7 +65,7 @@ async def download_orders(
             params = {
                 "startDate": start_date,
                 "page": page,
-                "limit": settings.GOMAG_LIMIT,
+                "limit": effective_limit,
             }
             try:
                 response = await client.get(settings.GOMAG_API_URL, headers=headers, params=params)