Refactor getGiftCost method in FalukantService for improved performance

- Changed getGiftCost from an asynchronous to a synchronous method, eliminating unnecessary await for better efficiency.
- Updated comments for clarity regarding the synchronous nature of gift cost calculation.
- Adjusted related code to reflect the synchronous execution, enhancing overall performance in gift cost retrieval.

backend/services/falukantService.js

@@ -3666,7 +3666,7 @@ class FalukantService extends BaseService {
             ]);
             timings.step5_load_gifts_and_title = Date.now() - step5Start;
 
-            // 6) Kosten berechnen (getGiftCost ist synchron, kein await nötig)
+            // 6) Kosten berechnen (getGiftCost ist synchron)
             const step6Start = Date.now();
             const result = gifts.map(gift => ({
                 id: gift.id,
@@ -3786,7 +3786,7 @@ class FalukantService extends BaseService {
         if (!gift) {
             throw new Error('notFound');
         }
-        const cost = await this.getGiftCost(
+        const cost = this.getGiftCost(
             gift.value,
             user.character.nobleTitle.id,
             lowestTitle.id
@@ -3842,7 +3842,7 @@ class FalukantService extends BaseService {
         }
     }
 
-    async getGiftCost(value, titleOfNobility, lowestTitleOfNobility) {
+    getGiftCost(value, titleOfNobility, lowestTitleOfNobility) {
         const titleLevel = titleOfNobility - lowestTitleOfNobility + 1;
         return Math.round(value * Math.pow(1 + titleLevel * 0.3, 1.3) * 100) / 100;
     }