feat(backend): add kiro account support

backend/internal/domain/constants_test.go

@@ -1,6 +1,9 @@
 package domain
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestDefaultAntigravityModelMapping_ImageCompatibilityAliases(t *testing.T) {
 	t.Parallel()
@@ -24,3 +27,54 @@ func TestDefaultAntigravityModelMapping_ImageCompatibilityAliases(t *testing.T)
 		}
 	}
 }
+
+func TestDefaultKiroModelMapping_MatchesKiroReferenceModels(t *testing.T) {
+	t.Parallel()
+
+	expected := map[string]string{
+		"claude-opus-4-6":                     "claude-opus-4.6",
+		"claude-opus-4-6-thinking":            "claude-opus-4.6",
+		"claude-sonnet-4-6":                   "claude-sonnet-4.6",
+		"claude-sonnet-4-6-thinking":          "claude-sonnet-4.6",
+		"claude-opus-4-5-20251101":            "claude-opus-4.5",
+		"claude-opus-4-5-20251101-thinking":   "claude-opus-4.5",
+		"claude-sonnet-4-5-20250929":          "claude-sonnet-4.5",
+		"claude-sonnet-4-5-20250929-thinking": "claude-sonnet-4.5",
+		"claude-haiku-4-5-20251001":           "claude-haiku-4.5",
+		"claude-haiku-4-5-20251001-thinking":  "claude-haiku-4.5",
+	}
+
+	if len(DefaultKiroModelMapping) != len(expected) {
+		t.Fatalf("expected %d Kiro mappings, got %d", len(expected), len(DefaultKiroModelMapping))
+	}
+	for model, want := range expected {
+		if got := DefaultKiroModelMapping[model]; got != want {
+			t.Fatalf("unexpected Kiro mapping for %q: got %q want %q", model, got, want)
+		}
+	}
+
+	for _, model := range []string{
+		"claude-opus-4-5",
+		"claude-sonnet-4-5",
+		"claude-sonnet-4",
+		"gpt-4o",
+		"gpt-4",
+		"deepseek-3-2",
+		"minimax-m2-1",
+		"qwen3-coder-next",
+		"claude-opus-4-7",
+		"claude-sonnet-4-6-chat",
+	} {
+		if _, ok := DefaultKiroModelMapping[model]; ok {
+			t.Fatalf("did not expect %q to remain in DefaultKiroModelMapping", model)
+		}
+	}
+	for model := range DefaultKiroModelMapping {
+		if strings.HasSuffix(model, "-agentic") {
+			t.Fatalf("did not expect agentic Kiro mapping %q", model)
+		}
+		if strings.HasSuffix(model, "-chat") {
+			t.Fatalf("did not expect chat-only Kiro mapping %q", model)
+		}
+	}
+}