Fix semester context, attendance rosters, and billing workflows

- load global semester helpers consistently and use date-based semester defaults
- fix grading and daily attendance duplicate student/section rows
- keep attendance violations scoped to the current semester by default
- update invoice, refund, discount, payment, and financial aid flows
- add configuration cleanup migrations for duplicate calendar/semester keys
- refresh parent registration/report-card and print request handling
- update related models, services, views, cron notes, and test coverage

app/Controllers/AuthController.php

@@ -38,7 +38,7 @@ class AuthController extends BaseController
         $this->loginActivityModel = new LoginActivityModel();
         $this->preferencesModel = new PreferencesModel();
         $this->schoolYear = $this->configModel->getConfig('school_year');
-        $this->semester = $this->configModel->getConfig('semester');
+        $this->semester = getSemester();
         
     }
 
@@ -332,7 +332,7 @@ class AuthController extends BaseController
             'state' => $requestData['state'] ?? null,
             'zip' => $requestData['zip'] ?? null,
             'school_year' => $this->configModel->getConfig('school_year'),
-            'semester' => $this->configModel->getConfig('semester'),
+            'semester' => getSemester(),
             'status' => 'active',
             'is_verified' => 0, // Require email verification
         ];