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/Migrations/AppDbContextModelSnapshot.cs

@@ -319,6 +319,13 @@ namespace JobsMedical.Web.Migrations
 
                     NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
 
+                    b.Property<int>("Confidence")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("ContentHash")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
                     b.Property<DateTime>("FetchedAt")
                         .HasColumnType("timestamp with time zone");
 
@@ -344,10 +351,18 @@ namespace JobsMedical.Web.Migrations
                     b.Property<int>("Status")
                         .HasColumnType("integer");
 
+                    b.Property<string>("ValidationNotes")
+                        .HasMaxLength(1000)
+                        .HasColumnType("character varying(1000)");
+
                     b.HasKey("Id");
 
+                    b.HasIndex("ContentHash");
+
                     b.HasIndex("LinkedShiftId");
 
+                    b.HasIndex("Status");
+
                     b.ToTable("RawListings");
                 });