Add scrape/ingestion engine + validation, and 24h shift hour-range visualization

Scrape engine (Services/Scraping/): pluggable IListingSource (working sample + Telegram/Divar credential-ready stubs) → IngestionService (content-hash dedupe → parse → validate → review queue) → ListingValidator (completeness score + spam screen) → IngestionWorker (config-gated hosted service). RawListing gains ContentHash/Confidence/ValidationNotes; RawListingStatus.Flagged. Admin /Admin gets run-now, source list, confidence + flagged queue.

Hour-range viz: _HourBar 24h timeline bar (colored by type, overnight wrap) on shift cards, recommendation cards, and detail.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Models/RawListing.cs

@@ -27,5 +27,16 @@ public class RawListing
     [MaxLength(500)]
     public string? SourceUrl { get; set; }
 
+    /// <summary>SHA-256 of the normalized text — used to dedupe across ingestion runs.</summary>
+    [MaxLength(64)]
+    public string? ContentHash { get; set; }
+
+    /// <summary>Parser+validator confidence 0–100 (how complete/usable the listing looks).</summary>
+    public int Confidence { get; set; }
+
+    /// <summary>Human-readable validation findings (missing fields, spam flags, etc.).</summary>
+    [MaxLength(1000)]
+    public string? ValidationNotes { get; set; }
+
     public DateTime FetchedAt { get; set; } = DateTime.UtcNow;
 }