Add user-related entities and enforce one-to-one mappings
Enhanced the User model with new entities: ContactInfo,
EnrollmentInfo, and HighSchool, establishing one-to-one
relationships. Updated UserDTO with additional fields and
introduced enums for type, quota, and major. Modified
UserRepository and AuthService to handle new entities.
Updated database schema with unique constraints on UserId
for related tables and added EF Core migration
20251027191028_dbRelations. Adjusted JSON serialization
to prevent circular references.
