first commit

RS_system/Services/ConfiguracionService.cs

@@ -0,0 +1,27 @@
+using Microsoft.EntityFrameworkCore;
+using Rs_system.Data;
+
+namespace Rs_system.Services;
+
+public class ConfiguracionService : IConfiguracionService
+{
+    private readonly ApplicationDbContext _context;
+
+    public ConfiguracionService(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<string?> GetValorAsync(string clave)
+    {
+        var config = await _context.Configuraciones
+            .FirstOrDefaultAsync(c => c.Clave == clave);
+        return config?.Valor;
+    }
+
+    public async Task<string> GetValorOrDefaultAsync(string clave, string defaultValue)
+    {
+        var valor = await GetValorAsync(clave);
+        return valor ?? defaultValue;
+    }
+}