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-search-data/Migrations/CvSearchDbContextModelSnapshot.cs

@@ -80,11 +80,19 @@ 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")
                         .HasDefaultValueSql("SYSUTCDATETIME()");
 
+                    b.Property<string>("Email")
+                        .HasMaxLength(256)
+                        .HasColumnType("nvarchar(256)");
+
                     b.Property<string>("JobText")
                         .IsRequired()
                         .HasColumnType("nvarchar(max)");
@@ -129,6 +137,10 @@ 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")