Add init weapon scraper

BlueLaminate/BlueLaminate.EFCore/Entities/ScrapeRun.cs

@@ -0,0 +1,19 @@
+namespace BlueLaminate.EFCore.Entities;
+
+/// <summary>
+/// One successful run of a data-scraping job. Used to throttle jobs that
+/// should run infrequently (e.g. the weapon catalogue, which changes rarely).
+/// Only successful runs are recorded, so a failed run never blocks a retry.
+/// </summary>
+public class ScrapeRun
+{
+    public int Id { get; set; }
+
+    /// <summary>Identifies which job this run belongs to, e.g. "weapons".</summary>
+    public string Source { get; set; } = null!;
+
+    public DateTimeOffset RanAt { get; set; }
+
+    /// <summary>How many records the run inserted or updated.</summary>
+    public int ItemCount { get; set; }
+}