feat(ClickTtView): add URL template selection for 'url' page type

- Introduced a new dropdown for selecting predefined URLs when the page type is set to 'url', enhancing user experience by providing quick access to common links.
- Included options for HTTV and TTDE login URLs to streamline navigation for users.

frontend/src/views/ClickTtView.vue

@@ -50,6 +50,17 @@
           />
         </div>
 
+        <div class="form-group" v-if="pageType === 'url'">
+          <label>URL-Vorlage</label>
+          <select v-model="directUrl" class="form-select form-input-wide">
+            <option value="">Bitte auswählen...</option>
+            <option value="https://httv.de">HTTV Einstieg: https://httv.de</option>
+            <option value="https://ttde-id.liga.nu/oauth2/authz/ttde?scope=nuLiga&response_type=code&redirect_uri=https%3A%2F%2Fhttv.click-tt.de%2Fcgi-bin%2FWebObjects%2FnuLigaTTDE.woa%2Fwa%2FoAuthLogin&state=nonce%3DVF6WbXUOvTjpsGq9zoZ6oxTH7625JEGH&client_id=XtVpGjXKAhz3BZuu">
+              TTDE Login: ttde-id.liga.nu/oauth2/authz/ttde...
+            </option>
+          </select>
+        </div>
+
         <div class="form-group" v-if="pageType === 'url'">
           <label>URL</label>
           <input