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/Migrations/CvSearchDbContextModelSnapshot.cs

@@ -197,6 +197,10 @@ namespace CvSearch.Data.Migrations
                         .HasMaxLength(64)
                         .HasColumnType("nvarchar(64)");
 
+                    b.Property<string>("ClientIpAddress")
+                        .HasMaxLength(45)
+                        .HasColumnType("nvarchar(45)");
+
                     b.Property<DateTime>("CreatedAt")
                         .ValueGeneratedOnAdd()
                         .HasColumnType("datetime2")