fix: kit discount amount + price sync no auto-insert + repackaging kit detection

Kit discount: v_disc_amt is per-kit, not per-unit — remove division by
v_cantitate_web so discount lines compute correctly (e.g. -2 x 5 = -10).

Price sync: stop auto-inserting missing articles into price policies
(was inserting with wrong proc_tvav from GoMag). Log warning instead.

Kit detection: extend to single-component repackagings (cantitate_roa > 1)
in both PL/SQL package and price sync/validation services.

Add repackaging kit pricing test for separate_line and distributed modes.

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

api/app/services/validation_service.py

@@ -450,8 +450,10 @@ def validate_kit_component_prices(mapped_codmat_data: dict, id_pol: int,
     try:
         with conn.cursor() as cur:
             for sku, components in mapped_codmat_data.items():
-                if len(components) <= 1:
-                    continue  # Not a kit
+                if len(components) == 0:
+                    continue
+                if len(components) == 1 and (components[0].get("cantitate_roa") or 1) <= 1:
+                    continue  # True 1:1 mapping, no kit pricing needed
                 sku_missing = []
                 for comp in components:
                     cont = str(comp.get("cont") or "").strip()