Add Email and ClientIpAddress audit fields to cvSearch.JobSearchSessions and JobSearchResults

Captures client IP at job-search link-click time and threads it through to the session.
Both Email and ClientIpAddress are copied from session to each result row during processing.
Closes #47

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jobs/cv-search-job/Tasks/CvSearchJobTask.cs

@@ -220,6 +220,8 @@ public sealed class CvSearchJobTask : IJobTask
                     JobText = string.Empty,
                     Score = matchResult.Score,
                     ResultJson = JsonSerializer.Serialize(matchResult, new JsonSerializerOptions(JsonSerializerDefaults.Web)),
+                    Email = session.Email,
+                    ClientIpAddress = session.ClientIpAddress,
                     CreatedAt = DateTime.UtcNow
                 };