Enhance partner search and gift loading functionality in FalukantService and FamilyView

- Added detailed logging for partner search criteria and results in FalukantService to improve debugging and traceability.
- Refactored partner search logic to use a dynamic where clause for better readability and maintainability.
- Implemented error handling in FamilyView for gift loading, ensuring an empty array is set on failure to load gifts, enhancing user experience.

frontend/src/views/falukant/FamilyView.vue

@@ -295,8 +295,13 @@ export default {
         },
 
         async loadGifts() {
-            const response = await apiClient.get('/api/falukant/family/gifts');
-            this.gifts = response.data;
+            try {
+                const response = await apiClient.get('/api/falukant/family/gifts');
+                this.gifts = response.data || [];
+            } catch (error) {
+                console.error('Error loading gifts:', error);
+                this.gifts = []; // Leeres Array bei Fehler
+            }
         },
 
         async sendGift() {