Backend Pacients, Doctors and MedicalHistory endpoints

- added for Pacients:
POST: /register
POST: /login
POST: /reset_password
PUT: /profile
DELETE: /profile

- added for Doctors:
POST: /register
POST: /login
POST: /reset_password
PUT: /profile
DELETE: /profile

- added for MedicalHistories:
POST: /:id (only by pacient) - done
GET: /:id (only by pacient) - done
PUT: /:id (only by doctor) - done
PUT /grand_access - TODO

backend/Application/Endpoints/Pacients/Profile/PacientProfileDto.cs

@@ -0,0 +1,9 @@
+namespace Application.Endpoints.Pacients.Profile;
+
+public class PacientProfileDTO
+{
+    public string Name { get; set; }
+    public string Email { get; set; }
+    public string Password { get; set; }
+    public string Description { get; set; }
+}

backend/Application/Endpoints/Pacients/Profile/PacientProfileHandler.cs

@@ -0,0 +1,120 @@
+using Application.Services.Database;
+
+namespace Application.Endpoints.Pacients.Profile;
+
+public class PacientProfileHandler
+{
+    private readonly IPacientRepository _pacientRepository;
+
+    public PacientProfileHandler(IPacientRepository pacientRepository)
+    {
+        _pacientRepository = pacientRepository;
+    }
+
+    public async Task<BaseResponse> HandleGet(Guid id)
+    {
+        var pacient = await _pacientRepository.GetByIdAsync(id).ConfigureAwait(false);
+        if (pacient != null)
+        {
+            return new BaseResponse
+            {
+                Success = true,
+                Message = $"Retrieved pacient with id: {id}",
+                Data = pacient
+            };
+        }
+
+        return new BaseResponse
+        {
+            Success = false,
+            Message = $"Pacient with id: {id} not found",
+            Data = null
+        };
+    }
+
+    public async Task<BaseResponse> HandleGetAll()
+    {
+        var pacients = await _pacientRepository.GetAllAsync().ConfigureAwait(false);
+        if (pacients.Any())
+        {
+            return new BaseResponse
+            {
+                Success = true,
+                Message = "Retrieved pacients",
+                Data = pacients.ToList()
+            };
+        }
+
+        return new BaseResponse
+        {
+            Success = false,
+            Message = "Pacients not found",
+            Data = null
+        };
+    }
+
+    public async Task<BaseResponse> HandleUpdate(Guid id, PacientProfileDTO updateDto)
+    {
+        var validation = new PacientProfileValidation(_pacientRepository);
+        var validationResult = await validation.ValidateAsync(updateDto);
+
+        if (!validationResult.IsValid)
+        {
+            var errorMessage = validationResult.Errors.Select(e => e.ErrorMessage).ToList();
+            return new BaseResponse
+            {
+                Success = false,
+                Message = string.Join(", ", errorMessage),
+                Data = null
+            };
+        }
+
+        var pacientToUpdate = await _pacientRepository.GetByIdAsync(id);
+
+        if (pacientToUpdate == null)
+        {
+            return new BaseResponse
+            {
+                Success = false,
+                Message = "Pacient not found for given Id",
+                Data = null
+            };
+        }
+
+        pacientToUpdate.Email = updateDto.Email;
+        pacientToUpdate.Password = updateDto.Password;
+        pacientToUpdate.Name = updateDto.Name;
+
+        await _pacientRepository.UpdateAsync(pacientToUpdate);
+
+        return new BaseResponse
+        {
+            Success = true,
+            Message = "Pacient updated successfully",
+            Data = pacientToUpdate
+        };
+    }
+
+    public async Task<BaseResponse> HandleDelete(Guid id)
+    {
+        var pacientToDelete = await _pacientRepository.GetByIdAsync(id);
+        if (pacientToDelete == null)
+        {
+            return new BaseResponse
+            {
+                Success = false,
+                Message = $"Pacient with id: {id} does not exist",
+                Data = null
+            };
+        }
+
+        await _pacientRepository.DeleteAsync(pacientToDelete);
+
+        return new BaseResponse
+        {
+            Success = true,
+            Message = $"Pacient with id: {id} was succesfully deleted",
+            Data = pacientToDelete
+        };
+    }
+}

backend/Application/Endpoints/Pacients/Profile/PacientProfileValidation.cs

@@ -0,0 +1,40 @@
+using Application.Services.Database;
+using FluentValidation;
+
+namespace Application.Endpoints.Pacients.Profile;
+
+public class PacientProfileValidation : AbstractValidator<PacientProfileDTO>
+{
+    private readonly IPacientRepository _pacientRepository;
+
+    public PacientProfileValidation(IPacientRepository pacientRepository)
+    {
+        _pacientRepository = pacientRepository;
+
+        RuleFor(x => x.Email)
+            .NotEmpty().WithMessage("Email is required.")
+            .EmailAddress().WithMessage("Invalid email format.")
+            .MustAsync(BeUniqueEmail).WithMessage("Email in use by another pacient.");
+
+        RuleFor(x => x.Password)
+            .NotEmpty().WithMessage("Password is required.")
+            .MinimumLength(8).WithMessage("Password must be at least 8 characters long.");
+
+        RuleFor(x => x.Name)
+            .NotEmpty().WithMessage("Name is required.")
+            .MinimumLength(3).WithMessage("Name must be at least 3 characters long.");
+
+        RuleFor(x => x.Description)
+            .MaximumLength(3000).WithMessage("Description must not exceed 3000 characters.");
+    }
+
+    private async Task<bool> BeUniqueEmail(string email, CancellationToken cancellationToken)
+    {
+        var pacient = await _pacientRepository.FindByEmailAsync(email);
+        if (pacient != null)
+        {
+            return pacient.Email.Equals(email, StringComparison.OrdinalIgnoreCase);
+        }
+        return pacient == null;
+    }
+}