First Commit

Helpers/ADS.Helpers.MultiTenant/Context/ITenantContextAccessor.cs

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+namespace ADS.Helpers.MultiTenant.Context;
+
+public interface ITenantContextAccessor
+{
+    TenantContext? Current { get; }
+    void SetCurrent(TenantContext? context);
+}

Helpers/ADS.Helpers.MultiTenant/Context/InMemoryTenantStore .cs

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+using ADS.Helpers.MultiTenant.Abstractions;
+using ADS.Helpers.MultiTenant.Context;
+
+namespace ADS.Helpers.MultiTenant.Stores;
+
+public sealed class InMemoryTenantStore : ITenantStore
+{
+    private readonly Dictionary<string, TenantContext> _tenants = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["demo"] = new TenantContext { TenantId = "demo", EmpresaId = 172, ClienteId = 1 }
+    };
+public Task<TenantContext?> GetAsync(string tenantKey)
+    {
+        _tenants.TryGetValue(tenantKey, out var tenant);
+        return Task.FromResult<TenantContext?>(tenant);
+    }
+}

Helpers/ADS.Helpers.MultiTenant/Context/TenantContext.cs

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+namespace ADS.Helpers.MultiTenant.Context;
+
+public sealed class TenantContext
+{
+    public int EmpresaId { get; set; }
+    public int ClienteId { get; set; }
+    public string TenantId { get; set; } = string.Empty;
+
+    public string Culture { get; set; } = "es-MX";
+    public string Theme { get; set; } = string.Empty;
+
+    public DatabaseConfig Database { get; set; } = new();
+
+    // Settings no tipados (solo si quieres algo rápido para cosas raras)
+    public Dictionary<string, string> CustomSettings { get; set; } = new();
+}
+
+public sealed class DatabaseConfig
+{
+    public string Provider { get; set; } = "SqlServer"; // SqlServer | Postgres
+    public string ConnectionString { get; set; } = string.Empty;
+}

Helpers/ADS.Helpers.MultiTenant/Context/TenantContextAccessor.cs

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+using System.Threading;
+
+namespace ADS.Helpers.MultiTenant.Context;
+
+public sealed class TenantContextAccessor : ITenantContextAccessor
+{
+    private static readonly AsyncLocal<TenantContext?> _current = new();
+
+    public TenantContext? Current => _current.Value;
+
+    public void SetCurrent(TenantContext? context) => _current.Value = context;
+}