feat(pricing): kit/pachet pricing with price list lookup, replace procent_pret

- Oracle PL/SQL: kit pricing logic with Mode A (distributed discount) and
  Mode B (separate discount line), dual policy support, PRETURI_CU_TVA flag
- Eliminate procent_pret from entire stack (Oracle, Python, JS, HTML)
- New settings: kit_pricing_mode, kit_discount_codmat, price_sync_enabled
- Settings UI: cards for Kit Pricing and Price Sync configuration
- Mappings UI: kit badges with lazy-loaded component prices from price list
- Price sync from orders: auto-update ROA prices when web prices differ
- Catalog price sync: new service to sync all GoMag product prices to ROA
- Kit component price validation: pre-check prices before import
- New endpoint GET /api/mappings/{sku}/prices for component price display
- New endpoints POST /api/price-sync/start, GET status, GET history
- DDL script 07_drop_procent_pret.sql (run after deploy confirmation)

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

api/app/services/gomag_client.py

@@ -101,3 +101,77 @@ async def download_orders(
                 await asyncio.sleep(1)
 
     return {"pages": total_pages, "total": total_orders, "files": saved_files}
+
+
+async def download_products(
+    api_key: str = None,
+    api_shop: str = None,
+    products_url: str = None,
+    log_fn: Callable[[str], None] = None,
+) -> list[dict]:
+    """Download all products from GoMag Products API.
+    Returns list of product dicts with: sku, price, vat, vat_included, bundleItems.
+    """
+    def _log(msg: str):
+        logger.info(msg)
+        if log_fn:
+            log_fn(msg)
+
+    effective_key = api_key or settings.GOMAG_API_KEY
+    effective_shop = api_shop or settings.GOMAG_API_SHOP
+    default_url = "https://api.gomag.ro/api/v1/product/read/json"
+    effective_url = products_url or default_url
+
+    if not effective_key or not effective_shop:
+        _log("GoMag API keys neconfigurați, skip product download")
+        return []
+
+    headers = {
+        "Apikey": effective_key,
+        "ApiShop": effective_shop,
+        "User-Agent": "Mozilla/5.0",
+        "Content-Type": "application/json",
+    }
+
+    all_products = []
+    total_pages = 1
+
+    async with httpx.AsyncClient(timeout=30) as client:
+        page = 1
+        while page <= total_pages:
+            params = {"page": page, "limit": 100}
+            try:
+                response = await client.get(effective_url, headers=headers, params=params)
+                response.raise_for_status()
+                data = response.json()
+            except httpx.HTTPError as e:
+                _log(f"GoMag Products API eroare pagina {page}: {e}")
+                break
+            except Exception as e:
+                _log(f"GoMag Products eroare neașteptată pagina {page}: {e}")
+                break
+
+            if page == 1:
+                total_pages = int(data.get("pages", 1))
+                _log(f"GoMag Products: {data.get('total', '?')} produse în {total_pages} pagini")
+
+            products = data.get("products", [])
+            if isinstance(products, dict):
+                products = [products]
+            if isinstance(products, list):
+                for p in products:
+                    if isinstance(p, dict) and p.get("sku"):
+                        all_products.append({
+                            "sku": p["sku"],
+                            "price": p.get("price", "0"),
+                            "vat": p.get("vat", "19"),
+                            "vat_included": p.get("vat_included", "1"),
+                            "bundleItems": p.get("bundleItems", []),
+                        })
+
+            page += 1
+            if page <= total_pages:
+                await asyncio.sleep(1)
+
+    _log(f"GoMag Products: {len(all_products)} produse cu SKU descărcate")
+    return all_products