feat(News): refactor news service and add sentiment tracking

FinlyticNews/Entities/ArticleSourceEntity.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Represents a news or feed source configuration retrieved from the database to discover article links.
+/// </summary>
+public class ArticleSourceEntity
+{
+    /// <summary>
+    /// Gets or sets the unique primary key identifier.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    /// <summary>
+    /// Gets or sets the target URL or domain feed address (e.g., RSS XML URL or HTML listing URL).
+    /// </summary>
+    [Required]
+    public string Source { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the human-readable display name of the news provider.
+    /// </summary>
+    [Required]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the adapter type keyword used to resolve the parsing adapter (e.g., "rss", "finanznachrichten").
+    /// </summary>
+    [Required]
+    public string Type { get; set; } = string.Empty;
+}

FinlyticNews/Entities/MatchedAssetEntity.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Represents a specific financial asset class match linked to a news article.
+/// </summary>
+public class MatchedAssetEntity
+{
+    /// <summary>
+    /// Gets or sets the unique primary key identifier.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    /// <summary>
+    /// Gets or sets the foreign key pointing to the associated news article.
+    /// </summary>
+    [Required]
+    public Guid NewsArticleId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the navigation property for the associated news article.
+    /// </summary>
+    [JsonIgnore]
+    public NewsArticleEntity? NewsArticle { get; set; }
+
+    /// <summary>
+    /// Gets or sets the ISIN of the matched asset.
+    /// </summary>
+    [Required]
+    public string Isin { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the matched asset name.
+    /// </summary>
+    [Required]
+    public string Name { get; set; } = string.Empty;
+}

FinlyticNews/Entities/NewsArticleEntity.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Represents a news article record stored in the database, tracking its lifecycle status and classification details.
+/// </summary>
+public class NewsArticleEntity
+{
+    /// <summary>
+    /// Gets or sets the unique primary key identifier.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// Gets or sets the title of the article.
+    /// </summary>
+    [Required]
+    public string Title { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the author of the article.
+    /// </summary>
+    public string? Author { get; set; }
+
+    /// <summary>
+    /// Gets or sets a brief summary of the article content.
+    /// </summary>
+    public string? Summary { get; set; }
+
+    /// <summary>
+    /// Gets or sets the raw extracted text content.
+    /// </summary>
+    [Required]
+    public string ContentRaw { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the language of the article.
+    /// </summary>
+    public string? Language { get; set; }
+
+    /// <summary>
+    /// Gets or sets the unique source URL of the article. Used for duplicate checking (idempotency).
+    /// </summary>
+    [Required]
+    public string SourceUrl { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the local timestamp when the scraper processed this article.
+    /// </summary>
+    public DateTime ScrapedAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the original publication date of the article.
+    /// </summary>
+    public DateTime PublishedAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the processing lifecycle state (e.g., "Pending", "Processing", "Completed", "Analyzed", "Failed").
+    /// </summary>
+    [Required]
+    public string Status { get; set; } = "Pending";
+
+    /// <summary>
+    /// Gets or sets the list of financial assets matched and associated with this news article.
+    /// </summary>
+    public List<MatchedAssetEntity> MatchedAssets { get; set; } = [];
+}

FinlyticNews/Entities/NewsSettingsEntity.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Entity representing global runtime settings for the FinlyticNews microservice.
+/// Persisted in PostgreSQL and updated dynamically via Admin Panel MQTT events.
+/// </summary>
+public class NewsSettingsEntity
+{
+    /// <summary>
+    /// Gets or sets the primary key for the settings row.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// Frequency in minutes for polling RSS feed sources.
+    /// </summary>
+    public int PollingFrequencyMinutes { get; set; } = 15;
+
+    /// <summary>
+    /// Article retention period in days before archival or cleanup.
+    /// </summary>
+    public int ArticleRetentionDays { get; set; } = 90;
+
+    /// <summary>
+    /// Default page size for historical news API pagination queries.
+    /// </summary>
+    public int DefaultPageSize { get; set; } = 20;
+
+    /// <summary>
+    /// Background scraper interval in minutes.
+    /// </summary>
+    public int ScrapingIntervalMinutes { get; set; } = 15;
+
+    /// <summary>
+    /// Webhook URL for n8n AI article analysis.
+    /// </summary>
+    public string N8nWebhookUrl { get; set; } = "http://localhost:5678/webhook/finlytic-news";
+
+    /// <summary>
+    /// Timestamp of last modification.
+    /// </summary>
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}