feat(core): update DTOs, Trade Republic client, Yahoo scrapers, and dynamic settings

FinlyticCore/Models/Settings/CoreSettingKeys.cs

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+namespace FinlyticCore.Models.Settings;
+
+/// <summary>
+/// Globale, mikroservice-übergreifende SettingKeys in FinlyticCore.
+/// </summary>
+public static class CoreSettingKeys
+{
+    // --- Logging-Kanäle ---
+    public static readonly SettingKey<bool> HealthPingChannel = new("Logging.Channel.Health", true);
+    public static readonly SettingKey<bool> MqttChannel = new("Logging.Channel.MQTT", true);
+    public static readonly SettingKey<bool> HtmlScrapperChannel = new("Logging.Channel.HtmlScrapper", true);
+    public static readonly SettingKey<bool> YahooClientChannel = new("Logging.Channel.YahooClient", true);
+    public static readonly SettingKey<bool> FundamentalsChannel = new("Logging.Channel.Fundamentals", true);
+
+    // --- Scraper & Feature-Toggles ---
+    public static readonly SettingKey<bool> EnableHtmlFallback = new("Feature.EnableHtmlFallback", true);
+    public static readonly SettingKey<bool> AllowForceRefresh = new("Feature.AllowForceRefresh", true);
+    public static readonly SettingKey<int> ScraperTimeoutSeconds = new("Scraper.TimeoutSeconds", 30);
+    public static readonly SettingKey<int> ScraperMaxRetries = new("Scraper.MaxRetries", 2);
+}

FinlyticCore/Models/Settings/LogLevelEnum.cs

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+namespace FinlyticCore.Models.Settings;
+
+public enum LogLevelEnum
+{
+    None,
+    Debug,
+    Info,
+    Error
+}

FinlyticCore/Models/Settings/SettingKey.cs

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+namespace FinlyticCore.Models.Settings;
+
+/// <summary>
+/// Verknüpft einen Setting-Key typsicher mit seinem Rückgabetyp T und einem Standardwert.
+/// </summary>
+public record SettingKey<T>(string Name, T DefaultValue);