fix: pricelist selection preserved when opening configurations

- Remove 'auto (latest active)' option from pricelist dropdowns; new
  configs pre-select the first active pricelist instead
- Stop resetting stored pricelist_id to null when it is not in the
  active list (deactivated pricelists are shown as inactive options)
- RefreshPricesNoAuth now accepts an optional pricelist_id; uses the
  UI-selected pricelist, then the config's stored pricelist, then
  latest as a last-resort fallback — no longer silently overwrites
  the stored pricelist on every price refresh
- Same fix applied to RefreshPrices (with auth)

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

cmd/qfs/main.go

@@ -1126,7 +1126,12 @@ func setupRouter(cfg *config.Config, local *localdb.LocalDB, connMgr *db.Connect
 
 			configs.POST("/:uuid/refresh-prices", func(c *gin.Context) {
 				uuid := c.Param("uuid")
-				config, err := configService.RefreshPricesNoAuth(uuid)
+				var req struct {
+					PricelistID *uint `json:"pricelist_id"`
+				}
+				// Ignore bind error — pricelist_id is optional
+				_ = c.ShouldBindJSON(&req)
+				config, err := configService.RefreshPricesNoAuth(uuid, req.PricelistID)
 				if err != nil {
 					respondError(c, http.StatusInternalServerError, "internal server error", err)
 					return