feat: add GitHub username field and implement commit filtering by author in intern dashboard

app/Http/Controllers/CareerController.php

@@ -208,22 +208,35 @@ class CareerController extends Controller
 
         $request->validate([
             'github_repo' => 'required|string|url|max:255',
+            'github_username' => 'nullable|string|max:100',
         ], [
             'github_repo.required' => 'Lütfen Github depo URL\'sini girin.',
             'github_repo.url' => 'Geçerli bir URL girilmelidir.',
             'github_repo.max' => 'Github depo URL\'si en fazla 255 karakter olabilir.',
+            'github_username.max' => 'Github kullanıcı adı en fazla 100 karakter olabilir.',
         ]);
 
         $intern = CareerApplication::findOrFail(session('intern_id'));
         
         // Sanitize & format github URL
         $repoUrl = trim($request->github_repo);
+        $username = trim($request->github_username);
         
         $intern->update([
-            'github_repo' => $repoUrl
+            'github_repo' => $repoUrl,
+            'github_username' => $username ?: null,
         ]);
 
-        return redirect()->back()->with('success', 'Github deposu başarıyla güncellendi.');
+        if ($request->expectsJson() || $request->ajax()) {
+            return response()->json([
+                'success' => true,
+                'message' => 'Github bilgileri başarıyla güncellendi.',
+                'github_repo' => $repoUrl,
+                'github_username' => $username ?: null,
+            ]);
+        }
+
+        return redirect()->back()->with('success', 'Github bilgileri başarıyla güncellendi.');
     }
 
     public function downloadMarkdown()

app/Models/CareerApplication.php

@@ -30,6 +30,7 @@ class CareerApplication extends Model
         'internship_end_date',
         'internship_total_days',
         'github_repo',
+        'github_username',
         'certificate_code',
         'transcript_markdown',
         'notebook_supervisor_signed',