Respect UI language in match result — LLM responds in user's selected language

The frontend sends the active language code (currentLang()) with every match
request. CvMatcherService injects a language instruction into the system prompt
so the LLM returns summary, strengths, gaps, recommendations, and evidence in
the correct language. The match result cache (CvMatchResults) now includes
Language as part of the lookup key so Romanian and English results are stored
and retrieved independently. Existing cached rows default to 'en'.

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

Apis/cv-matcher-api/Migrations/20260524140335_AddLanguageToCvMatchResult.Designer.cs

@@ -0,0 +1,99 @@
+// <auto-generated />
+using System;
+using Api.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace Api.Migrations
+{
+    [DbContext(typeof(CvMatcherDbContext))]
+    [Migration("20260524140335_AddLanguageToCvMatchResult")]
+    partial class AddLanguageToCvMatchResult
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasDefaultSchema("cvMatcher")
+                .HasAnnotation("ProductVersion", "10.0.7")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+
+            modelBuilder.Entity("Api.Data.Entities.CvMatchResultEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasMaxLength(64)
+                        .HasColumnType("nvarchar(64)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("SYSUTCDATETIME()");
+
+                    b.Property<string>("CvDocumentId")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("nvarchar(64)");
+
+                    b.Property<string>("JobDocumentId")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("nvarchar(64)");
+
+                    b.Property<string>("Language")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("ResultJson")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<int>("Score")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CvDocumentId", "JobDocumentId")
+                        .IsUnique();
+
+                    b.ToTable("Results", "cvMatcher");
+                });
+
+            modelBuilder.Entity("Api.Data.Entities.CvMatcherChatCacheEntity", b =>
+                {
+                    b.Property<string>("CacheKey")
+                        .HasMaxLength(64)
+                        .HasColumnType("nvarchar(64)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("SYSUTCDATETIME()");
+
+                    b.Property<string>("Model")
+                        .IsRequired()
+                        .HasMaxLength(120)
+                        .HasColumnType("nvarchar(120)");
+
+                    b.Property<string>("ResponseText")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<decimal>("Temperature")
+                        .HasColumnType("decimal(4,2)");
+
+                    b.HasKey("CacheKey");
+
+                    b.ToTable("ChatCache", "cvMatcher");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Apis/cv-matcher-api/Migrations/20260524140335_AddLanguageToCvMatchResult.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Api.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddLanguageToCvMatchResult : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Language",
+                schema: "cvMatcher",
+                table: "Results",
+                type: "nvarchar(max)",
+                nullable: false,
+                defaultValue: "en");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Language",
+                schema: "cvMatcher",
+                table: "Results");
+        }
+    }
+}

Apis/cv-matcher-api/Migrations/CvMatcherDbContextModelSnapshot.cs

@@ -44,6 +44,10 @@ namespace Api.Migrations
                         .HasMaxLength(64)
                         .HasColumnType("nvarchar(64)");
 
+                    b.Property<string>("Language")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
                     b.Property<string>("ResultJson")
                         .IsRequired()
                         .HasColumnType("nvarchar(max)");