feat: adaptación de los proyectos para utilizar .env y comienzo de preparación para despliegue en docker

src/Mercados.Infrastructure/DataFetchers/TickerNameMapping.cs

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+namespace Mercados.Infrastructure.DataFetchers
+{
+    public static class TickerNameMapping
+    {
+        private static readonly Dictionary<string, string> Names = new(StringComparer.OrdinalIgnoreCase)
+        {
+          // USA
+            { "SPY", "S&P 500 ETF" }, // Cambiado de GSPC a SPY para Finnhub
+            { "AAPL", "Apple Inc." },
+            { "MSFT", "Microsoft Corp." },
+            { "AMZN", "Amazon.com, Inc." },
+            { "NVDA", "NVIDIA Corp." },
+            { "AMD", "Advanced Micro Devices" },
+            { "KO", "The Coca-Cola Company" },
+            { "BRK-B", "Berkshire Hathaway Inc." },
+            { "GLD", "SPDR Gold Shares" },
+            { "XLF", "Financial Select Sector SPDR" },
+            { "XLI", "Industrial Select Sector SPDR" },
+            { "XLE", "Energy Select Sector SPDR" },
+            { "XLK", "Technology Select Sector SPDR" },
+            { "MELI", "MercadoLibre, Inc." },
+            { "GLOB", "Globant" },
+            
+            // ADRs Argentinos que cotizan en EEUU
+            { "YPF", "YPF S.A. (ADR)" },
+            { "GGAL", "Grupo Financiero Galicia (ADR)" },
+            { "BMA", "Banco Macro (ADR)" },
+            { "LOMA", "Loma Negra (ADR)" },
+            { "PAM", "Pampa Energía (ADR)" },
+            { "TEO", "Telecom Argentina (ADR)" },
+            { "TGS", "Transportadora de Gas del Sur (ADR)" },
+            { "EDN", "Edenor (ADR)" },
+            { "CRESY", "Cresud (ADR)" },
+            { "CEPU", "Central Puerto (ADR)" },
+            { "BBAR", "BBVA Argentina (ADR)" },
+
+            // Argentina Local
+            { "^GSPC", "S&P 500 Index" }, // Lo dejamos por si Yahoo lo devuelve
+            { "^MERV", "S&P Merval" },
+            { "GGAL.BA", "Grupo Financiero Galicia" },
+            { "YPFD.BA", "YPF S.A." },
+            { "PAMP.BA", "Pampa Energía" },
+            { "BMA.BA", "Banco Macro" },
+            { "COME.BA", "Sociedad Comercial del Plata" },
+            { "TECO2.BA", "Telecom Argentina" },
+            { "EDN.BA", "Edenor" },
+            { "CRES.BA", "Cresud" },
+            { "TXAR.BA", "Ternium Argentina" },
+            { "MIRG.BA", "Mirgor" },
+            { "CEPU.BA", "Central Puerto" },
+            { "LOMA.BA", "Loma Negra" },
+            { "VALO.BA", "Banco de Valores" },
+            { "MELI.BA", "MercadoLibre (CEDEAR)" }, // Aclaramos que es el CEDEAR
+        };
+
+        public static string? GetName(string ticker)
+        {
+            return Names.GetValueOrDefault(ticker);
+        }
+    }
+}