prepopulating db from frontend and backend for document selection

backend/src/main/java/hu/pazmany/Controller.java

backend/src/main/java/hu/pazmany/DocumentRepository.java

backend/src/main/java/hu/pazmany/NoteStoreService.java

backend/src/main/java/hu/pazmany/SubjectDto.java

backend/src/main/java/hu/pazmany/UserService.java

...ain/resources/3.eloadas_szoftvertechnologia_2024_v1.0.pdf

frontend/src/components/browse-komponens.vue