Display timestamps in Tehran time, not UTC

The server clock is correct (UTC); the app rendered UTC wall-clock directly, so
the run log showed ~3.5h behind Tehran. Add JalaliDate.ToTehran (flat UTC+3:30 —
Iran dropped DST in 2022) + DateTimeLabel, and convert the UTC-stored timestamp
displays (ingestion run log, RawListing FetchedAt, report CreatedAt). Shift
start/end inputs are TimeOnly, left as-is.

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

src/JobsMedical.Web/Services/JalaliDate.cs

@@ -25,6 +25,18 @@ public static class JalaliDate
 
     private static readonly char[] PersianDigits = { '۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹' };
 
+    /// <summary>Convert a UTC timestamp (we store everything as <c>DateTime.UtcNow</c>) to Tehran
+    /// wall-clock. Iran is a fixed UTC+3:30 (DST abolished in 2022), so a flat offset is exact and
+    /// needs no timezone database.</summary>
+    public static DateTime ToTehran(DateTime utc) => utc.AddMinutes(210);
+
+    /// <summary>Jalali date + Tehran time, e.g. «۳۰ خرداد ۱۴۰۵ ۱۶:۲۱» — for UTC-stored timestamps.</summary>
+    public static string DateTimeLabel(DateTime utc)
+    {
+        var t = ToTehran(utc);
+        return ToLongDate(DateOnly.FromDateTime(t)) + " " + ToPersianDigits(t.ToString("HH:mm"));
+    }
+
     /// <summary>Convert Latin digits in a string to Persian digits.</summary>
     public static string ToPersianDigits(string input)
     {