fix(mappings): move sku/codmat from path to query — slash in keys 404'd

Codurile ROA contin legitim '/' si '"' (ex. RCR1/4"). Rutele FastAPI
foloseau parametri de cale (/api/mappings/{sku}/{codmat}...); ASGI decodeaza
%2F -> '/' INAINTE de routing, deci o cheie cu slash devine doua segmente si
Starlette nu mai potriveste ruta -> 404 la edit/delete/restore. Cand ambii
parametri au slash, un convertor {path} nu rezolva (split ambiguu).

Solutie: sku/codmat trec din cale in query string. %2F/%22 din query se
decodeaza ca parte a valorii, fara sa atinga routing-ul de cale.

- backend: 4 rute statice + Query(...) (update/edit/delete/restore);
  semnaturile mapping_service raman neschimbate
- frontend: helper mapQS(); toate cele 8 apeluri path -> query; cache-bust ?v=19
- tests: regresie ci-layer (chei-sentinel cu slash, !=404, toate 4 rutele);
  test_integration update/delete convertite la query; e2e delete RCR1/4"
  (slash+ghilimea) prin modalul UI, skip cand Oracle lipseste

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

api/app/routers/mappings.py

@@ -95,16 +95,18 @@ async def create_mapping(data: MappingCreate):
     except Exception as e:
         return {"success": False, "error": str(e)}
 
-@router.put("/api/mappings/{sku}/{codmat}")
-def update_mapping(sku: str, codmat: str, data: MappingUpdate):
+# sku/codmat in query string (not path) — codurile ROA contin legitim '/' si '"'
+# (ex. RCR1/4"); %2F in path e decodat de ASGI inainte de routing -> 404.
+@router.put("/api/mappings/update")
+def update_mapping(data: MappingUpdate, sku: str = Query(...), codmat: str = Query(...)):
     try:
         updated = mapping_service.update_mapping(sku, codmat, data.cantitate_roa, data.activ)
         return {"success": updated}
     except Exception as e:
         return {"success": False, "error": str(e)}
 
-@router.put("/api/mappings/{sku}/{codmat}/edit")
-def edit_mapping(sku: str, codmat: str, data: MappingEdit):
+@router.put("/api/mappings/edit")
+def edit_mapping(data: MappingEdit, sku: str = Query(...), codmat: str = Query(...)):
     try:
         result = mapping_service.edit_mapping(sku, codmat, data.new_sku, data.new_codmat,
                                                data.cantitate_roa)
@@ -112,16 +114,16 @@ def edit_mapping(sku: str, codmat: str, data: MappingEdit):
     except Exception as e:
         return {"success": False, "error": str(e)}
 
-@router.delete("/api/mappings/{sku}/{codmat}")
-def delete_mapping(sku: str, codmat: str):
+@router.delete("/api/mappings/delete")
+def delete_mapping(sku: str = Query(...), codmat: str = Query(...)):
     try:
         deleted = mapping_service.delete_mapping(sku, codmat)
         return {"success": deleted}
     except Exception as e:
         return {"success": False, "error": str(e)}
 
-@router.post("/api/mappings/{sku}/{codmat}/restore")
-def restore_mapping(sku: str, codmat: str):
+@router.post("/api/mappings/restore")
+def restore_mapping(sku: str = Query(...), codmat: str = Query(...)):
     try:
         restored = mapping_service.restore_mapping(sku, codmat)
         return {"success": restored}