refactor(clickTtPlayerRegistrationService): improve nationality and country selection logic

- Replaced direct option selection with a new method that selects options based on partial label matching, enhancing flexibility in form filling.
- Introduced the _selectOptionByLabelContains method to streamline the selection process for nationality and country fields, improving code maintainability.

backend/services/clickTtPlayerRegistrationService.js

@@ -412,7 +412,7 @@ class ClickTtPlayerRegistrationService {
     if (await nationalitySelect.count()) {
       const currentValue = await nationalitySelect.inputValue().catch(() => 'WONoSelectionString');
       if (!currentValue || currentValue === 'WONoSelectionString') {
-        await nationalitySelect.selectOption({ label: /Deutschland/ });
+        await this._selectOptionByLabelContains(nationalitySelect, 'Deutschland');
       }
     }
 
@@ -420,7 +420,7 @@ class ClickTtPlayerRegistrationService {
     if (await countrySelect.count()) {
       const currentValue = await countrySelect.inputValue().catch(() => 'WONoSelectionString');
       if (!currentValue || currentValue === 'WONoSelectionString') {
-        await countrySelect.selectOption({ label: /Deutschland/ });
+        await this._selectOptionByLabelContains(countrySelect, 'Deutschland');
       }
     }
 
@@ -512,6 +512,27 @@ class ClickTtPlayerRegistrationService {
     return true;
   }
 
+  async _selectOptionByLabelContains(locator, text) {
+    if (!(await locator.count())) {
+      return false;
+    }
+
+    const optionValue = await locator.evaluate((select, searchText) => {
+      const normalizedSearch = String(searchText || '').toLowerCase();
+      const option = Array.from(select.options).find((entry) =>
+        String(entry.textContent || '').toLowerCase().includes(normalizedSearch)
+      );
+      return option?.value || null;
+    }, text);
+
+    if (!optionValue) {
+      return false;
+    }
+
+    await locator.selectOption(optionValue);
+    return true;
+  }
+
   async _hasTextTarget(page, text) {
     const escaped = escapeRegExp(text);
     const selectors = [