feat(Core): update DTOs and shared models

FinlyticCore/Dtos/Yahoo/YahooValueDto.cs

@@ -0,0 +1,36 @@
+using System.Text.Json.Serialization;
+
+namespace FinlyticCore.Dtos.Yahoo;
+
+/// <summary>
+/// Represents a Yahoo Finance value wrapper containing raw numerical data alongside formatted strings.
+/// </summary>
+public record YahooValueDto
+{
+    [JsonPropertyName("raw")]
+    public double? Raw { get; init; }
+
+    [JsonPropertyName("fmt")]
+    public string? Fmt { get; init; }
+
+    [JsonPropertyName("longFmt")]
+    public string? LongFmt { get; init; }
+
+    /// <summary>
+    /// Helper property to retrieve Raw as double (or fallback 0.0).
+    /// </summary>
+    [JsonIgnore]
+    public double DoubleValue => Raw ?? 0.0;
+
+    /// <summary>
+    /// Helper property to retrieve Raw as decimal (or fallback 0m).
+    /// </summary>
+    [JsonIgnore]
+    public decimal DecimalValue => Raw.HasValue ? (decimal)Raw.Value : 0m;
+
+    /// <summary>
+    /// Helper property to retrieve Raw as long (or fallback 0L).
+    /// </summary>
+    [JsonIgnore]
+    public long LongValue => Raw.HasValue ? (long)Raw.Value : 0L;
+}