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>

Apis/api/Controllers/CvMatcherController.cs

@@ -245,7 +245,8 @@ public sealed class CvMatcherController : ControllerBase
     {
         try
         {
-            var result = await _jobSearchApi.StartSearchAsync(t, ct);
+            var userIp = HttpContext.Connection.RemoteIpAddress?.ToString();
+            var result = await _jobSearchApi.StartSearchAsync(t, new StartJobSearchRequest { ClientIpAddress = userIp }, ct);
             var lang = "en";
             var (title, message) = result.Status switch
             {