Fix flea avg and fee calculations (!265)

Properly calculate the flea average, excluding barter offers for a more live-like result
Prioritize handbook price for the /client/items/prices route to match live

Co-authored-by: DrakiaXYZ <565558+TheDgtl@users.noreply.github.com>
Reviewed-on: https://dev.sp-tarkov.com/SPT-AKI/Server/pulls/265
Co-authored-by: DrakiaXYZ <drakiaxyz@noreply.dev.sp-tarkov.com>
Co-committed-by: DrakiaXYZ <drakiaxyz@noreply.dev.sp-tarkov.com>

project/src/controllers/RagfairController.ts

@@ -352,7 +352,21 @@ export class RagfairController
             const min = offers[0].requirementsCost; // Get first item from array as its pre-sorted
             const max = offers.at(-1).requirementsCost; // Get last item from array as its pre-sorted
 
-            return { avg: (min + max) / 2, min: min, max: max };
+            // Get the average offer price, excluding barter offers
+            let avgOfferCount = 0;
+            const avg = offers.reduce((sum, offer) =>
+            {
+                // Exclude barter items
+                if (offer.requirements.some((req) => !this.paymentHelper.isMoneyTpl(req._tpl)))
+                {
+                    return sum;
+                }
+
+                avgOfferCount++;
+                return sum + offer.requirementsCost;
+            }, 0) / Math.max(avgOfferCount, 1);
+
+            return { avg: avg, min: min, max: max };
         }
 
         // No offers listed, get price from live ragfair price list prices.json

project/src/services/RagfairPriceService.ts

@@ -171,13 +171,14 @@ export class RagfairPriceService implements OnLoad
     }
 
     /**
-     * Get prices for all items on flea, priorities dynamic prices from prices.json, use handbook prices if missing
+     * Get prices for all items on flea, prioritize handbook prices first, use prices from prices.json if missing
      * @returns Dictionary of item tpls and rouble cost
      */
     public getAllFleaPrices(): Record<string, number>
     {
-        // assign static values first, then overwrite them with dynamic, any values not stored in dynamic data will be covered by static data
-        return { ...this.prices.static, ...this.prices.dynamic };
+        // assign dynamic (prices.json) values first, then overwrite them with static (handbook.json)
+        // any values not stored in static data will be covered by dynamic data
+        return { ...this.prices.dynamic, ...this.prices.static };
     }
 
     public getAllStaticPrices(): Record<string, number>