fix: Missing input validators + No patient update endpoint + Pagination inconsistencies + Missing list/get endpoints

VigilCareClinicalAPI/Services/PatientService.cs

@@ -90,6 +90,44 @@ public class PatientService : IPatientService
         return new PagedResult<Patient>(patients, page, pageSize, total);
     }
 
+    public async Task<Patient> UpdateAsync(Guid id, UpdatePatientRequest req)
+    {
+        var patient = await _db.Patients.FindAsync(id)
+            ?? throw new NotFoundException("Patient not found.", "PATIENT_NOT_FOUND");
+
+        var before = new
+        {
+            patient.FirstName, patient.LastName, patient.DateOfBirth,
+            patient.Gender, patient.BloodType, patient.Allergies,
+            patient.EmergencyContactName, patient.EmergencyContactPhone
+        };
+
+        if (req.FirstName is not null) patient.FirstName = req.FirstName;
+        if (req.LastName is not null) patient.LastName = req.LastName;
+        if (req.DateOfBirth is not null) patient.DateOfBirth = req.DateOfBirth.Value;
+        if (req.Gender is not null) patient.Gender = req.Gender;
+        if (req.BloodType is not null) patient.BloodType = req.BloodType;
+        if (req.Allergies is not null) patient.Allergies = req.Allergies;
+        if (req.EmergencyContactName is not null) patient.EmergencyContactName = req.EmergencyContactName;
+        if (req.EmergencyContactPhone is not null) patient.EmergencyContactPhone = req.EmergencyContactPhone;
+
+        await _db.SaveChangesAsync();
+
+        await _audit.WriteAsync(
+            AuditAction.PatientUpdated,
+            "Patient",
+            patient.Id,
+            previousValue: before,
+            newValue: new
+            {
+                patient.FirstName, patient.LastName, patient.DateOfBirth,
+                patient.Gender, patient.BloodType, patient.Allergies,
+                patient.EmergencyContactName, patient.EmergencyContactPhone
+            });
+
+        return patient;
+    }
+
     public async Task<Patient> GetByIdAsync(Guid id)
     {
         var patient = await _db.Patients