feat: add OpenEduCat institutional LMS features + Odoo 19 Backend SRS

- Update ENCOACH_UNIFIED_SRS.md with 6 new feature sections:
  Academic Year/Term, Departments, Admission/Enrollment,
  Subject Registration, Institutional Exams, Assignment Submissions
- Add TypeScript types: academic.ts, admission.ts, institutional-exam.ts
- Add API services: academic, admission, institutional-exam
- Add TanStack Query hooks: useAcademic, useAdmissions, useInstitutionalExams
- Add 9 new pages: AcademicYearManager, DepartmentManager, AdmissionList,
  AdmissionDetail, AdmissionRegisterPage, AdmissionApplication,
  SubjectRegistrationPage, InstitutionalExamSessions, MarksheetManager
- Update App.tsx routes, AdminLmsLayout sidebar (Institutional group),
  StudentLayout sidebar (Subject Registration)
- Generate ENCOACH_ODOO19_BACKEND_SRS.md: complete Odoo 19 backend spec
  covering 200+ REST API endpoints, 31 modules, all OpenEduCat models

Made-with: Cursor

src/hooks/queries/index.ts

@@ -5,4 +5,7 @@ export * from "./useExams";
 export * from "./useAssignments";
 export * from "./useEntities";
 export * from "./useAdaptive";
+export * from "./useAcademic";
+export * from "./useAdmissions";
+export * from "./useInstitutionalExams";
 export { usePermissions } from "../usePermissions";