Store match-time ClientIpAddress on cvSearch.JobSearchTokens

Captures the IP when the user submits the CV match form and stores it on
the token, giving a full audit trail: token holds the match-site IP,
session holds the email link-click IP.

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

Apis/cv-search-data/Data/Entities/JobSearchTokenEntity.cs

@@ -11,4 +11,6 @@ public sealed class JobSearchTokenEntity : BaseEntity
     public bool Used { get; set; }
     public string Keywords { get; set; } = string.Empty;
     public string? Location { get; set; }
+    /// <summary>Client IP address captured when the user submitted the CV match request. Null for tokens created before this field was added.</summary>
+    public string? ClientIpAddress { get; set; }
 }