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/View/LateSlipLogsController.php

@@ -22,7 +22,7 @@ class LateSlipLogsController extends BaseController
         $req = $this->request;
 
         $defaultYear = $this->currentSchoolYearName((string) ($this->schoolYear ?? ''));
-        $defaultSem  = (string) ($this->configModel->getConfig('semester')    ?? '');
+        $defaultSem  = (string) (getSemester()    ?? '');
         $schoolYear  = trim((string) ($req->getGet('school_year') ?? $defaultYear));
         $semester    = trim((string) ($req->getGet('semester')    ?? $defaultSem));
         $q           = trim((string) ($req->getGet('q') ?? ''));