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/cv-matcher-api/Services/JobTokenService.cs

@@ -63,7 +63,7 @@ public sealed class JobTokenService : IJobTokenService
     }
 
     /// <inheritdoc />
-    public async Task<string> TriggerStartAsync(string tokenId, CancellationToken ct)
+    public async Task<string> TriggerStartAsync(string tokenId, string? clientIpAddress, CancellationToken ct)
     {
         var token = await _db.JobSearchTokens.FirstOrDefaultAsync(x => x.Id == tokenId, ct);
         if (token is null) return StartJobSearchStatus.NotFound;
@@ -94,6 +94,7 @@ public sealed class JobTokenService : IJobTokenService
             Status = JobSearchStatus.Pending,
             Keywords = keywords,
             Location = token.Location,
+            ClientIpAddress = clientIpAddress,
             ProviderConfigJson = providerConfigJson,
             CreatedAt = DateTime.UtcNow
         };