refactor(autofix-request): remove deprecated card component

Remove the deprecated AutofixRequestCard component from the submissions
page details and its template to streamline the codebase. Update the
autofix-request model to include a computed adminUrl property for direct
link generation. Modify the autofix-container component template to use
the new CoursePage::TestResultsBar::AutofixRequestCard component and
improve the admin link UI for easier access.
These changes improve maintainability and unify the UI components for
autofix requests in the course admin interface.

Author: rohitpaulk

app/components/course-admin/submissions-page/submission-details/autofix-container.hbs

@@ -1,6 +1,15 @@
 <div class="course-admin-submission-autofix-container" ...attributes>
   {{#if this.latestAutofixRequest}}
-    <CourseAdmin::SubmissionsPage::SubmissionDetails::AutofixRequestCard @autofixRequest={{this.latestAutofixRequest}} class="mb-4" />
+    <div class="prose prose-sm prose-compact dark:prose-invert mb-4">
+      <a class="flex items-center gap-1" href={{this.latestAutofixRequest.adminUrl}} target="_blank" rel="noopener noreferrer">
+        <span>Admin Panel</span>
+        {{svg-jar "external-link" class="w-4 h-4"}}
+      </a>
+    </div>
+
+    <div class="dark">
+      <CoursePage::TestResultsBar::AutofixRequestCard @autofixRequest={{this.latestAutofixRequest}} class="mb-4" />
+    </div>
   {{else}}
     <div class="bg-gray-800 p-4 text-white font-mono text-xs leading-relaxed rounded-sm mb-4">
       This submission doesn't have any autofix requests.

app/components/course-admin/submissions-page/submission-details/autofix-request-card.hbs

@@ -1,6 +1,7 @@
 import Model, { attr, belongsTo } from '@ember-data/model';
 import RepositoryModel from 'codecrafters-frontend/models/repository';
 import SubmissionModel from 'codecrafters-frontend/models/submission';
+import config from 'codecrafters-frontend/config/environment';
 
 export default class AutofixRequestModel extends Model {
   @belongsTo('submission', { async: false, inverse: 'autofixRequests' }) declare submission: SubmissionModel;
@@ -16,6 +17,10 @@ export default class AutofixRequestModel extends Model {
   @attr('string') declare status: string; // 'in_progress' | 'success' | 'failure' | 'error'
   @attr('string') declare summary: string;
 
+  get adminUrl() {
+    return `${config.x.backendUrl}/admin/autofix_requests/${this.id}`;
+  }
+
   get creatorTypeIsStaff() {
     return this.creatorType === 'staff';
   }