implementato modulo HR

src/backend/Zentral.Domain/Entities/HR/Assenza.cs

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+using System;
+
+namespace Zentral.Domain.Entities.HR;
+
+public class Assenza : BaseEntity
+{
+    public int DipendenteId { get; set; }
+    public Dipendente Dipendente { get; set; } = null!;
+    
+    public DateTime DataInizio { get; set; }
+    public DateTime DataFine { get; set; }
+    public string TipoAssenza { get; set; } = string.Empty; 
+    public string Stato { get; set; } = "Richiesta"; 
+    public string? Note { get; set; }
+}

src/backend/Zentral.Domain/Entities/HR/Contratto.cs

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+using System;
+
+namespace Zentral.Domain.Entities.HR;
+
+public class Contratto : BaseEntity
+{
+    public int DipendenteId { get; set; }
+    public Dipendente Dipendente { get; set; } = null!;
+    
+    public DateTime DataInizio { get; set; }
+    public DateTime? DataFine { get; set; }
+    public string TipoContratto { get; set; } = string.Empty; 
+    public string? Livello { get; set; }
+    public decimal RetribuzioneLorda { get; set; }
+    public string? Note { get; set; }
+    public bool Attivo { get; set; } = true;
+}

src/backend/Zentral.Domain/Entities/HR/Dipendente.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Zentral.Domain.Entities.HR;
+
+public class Dipendente : BaseEntity
+{
+    public string Nome { get; set; } = string.Empty;
+    public string Cognome { get; set; } = string.Empty;
+    public string? CodiceFiscale { get; set; }
+    public string? Email { get; set; }
+    public string? Telefono { get; set; }
+    public string? Indirizzo { get; set; }
+    public DateTime? DataNascita { get; set; }
+    public string? Ruolo { get; set; } 
+    
+    public List<Contratto> Contratti { get; set; } = new();
+    public List<Assenza> Assenze { get; set; } = new();
+    public List<Pagamento> Pagamenti { get; set; } = new();
+    public List<Rimborso> Rimborsi { get; set; } = new();
+}

src/backend/Zentral.Domain/Entities/HR/Pagamento.cs

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+using System;
+
+namespace Zentral.Domain.Entities.HR;
+
+public class Pagamento : BaseEntity
+{
+    public int DipendenteId { get; set; }
+    public Dipendente Dipendente { get; set; } = null!;
+    
+    public DateTime DataPagamento { get; set; }
+    public decimal ImportoNetto { get; set; }
+    public string Descrizione { get; set; } = string.Empty; 
+    public bool Pagato { get; set; } = false;
+}

src/backend/Zentral.Domain/Entities/HR/Rimborso.cs

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+using System;
+
+namespace Zentral.Domain.Entities.HR;
+
+public class Rimborso : BaseEntity
+{
+    public int DipendenteId { get; set; }
+    public Dipendente Dipendente { get; set; } = null!;
+    
+    public DateTime DataSpesa { get; set; }
+    public decimal Importo { get; set; }
+    public string Descrizione { get; set; } = string.Empty;
+    public string Stato { get; set; } = "Richiesto"; 
+}