Add Email and ClientIpAddress audit fields to cvMatcher.Results

Threads the caller's email and client IP through the match pipeline so
every Results row records who triggered the match and from where.
Closes #45

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

Apis/cv-matcher-data/Repositories/EfMatcherRepository.cs

@@ -40,7 +40,7 @@ public sealed class EfMatcherRepository : IMatcherRepository
         return result;
     }
 
-    public async Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, string language, JobMatchResponse response, CancellationToken ct)
+    public async Task SaveMatchAsync(string cvDocumentId, string jobDocumentId, string language, JobMatchResponse response, string? email, string? clientIpAddress, CancellationToken ct)
     {
         var exists = await _db.CvMatchResults.AnyAsync(
             x => x.CvDocumentId == cvDocumentId && x.JobDocumentId == jobDocumentId && x.Language == language,
@@ -58,6 +58,8 @@ public sealed class EfMatcherRepository : IMatcherRepository
                 Language = language,
                 ResultJson = JsonSerializer.Serialize(response, new JsonSerializerOptions(JsonSerializerDefaults.Web)),
                 Score = response.Score,
+                Email = email,
+                ClientIpAddress = clientIpAddress,
                 CreatedAt = DateTime.UtcNow
             });