fix: невалидное имя варианта проекта — предупреждение вместо ошибки

Имя варианта "main" или с недопустимыми символами больше не отклоняет
запрос ошибкой 400 — теперь автоматически конвертируется в валидное
(sanitizeProjectVariantName), а API/UI показывают variant_warning вместо
блокировки создания/переименования варианта.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/services/project_test.go

@@ -1,37 +1,47 @@
 package services
 
 import (
-	"errors"
 	"path/filepath"
 	"testing"
 
 	"git.mchus.pro/mchus/quoteforge/internal/localdb"
 )
 
-func TestProjectServiceCreateRejectsReservedMainVariant(t *testing.T) {
+// TestProjectServiceCreateSanitizesReservedMainVariant verifies that naming a new
+// variant "main" no longer errors: the name is auto-converted to a valid one and a
+// warning is returned instead of the request being rejected.
+func TestProjectServiceCreateSanitizesReservedMainVariant(t *testing.T) {
 	local, err := newProjectTestLocalDB(t)
 	if err != nil {
 		t.Fatalf("open localdb: %v", err)
 	}
 	service := NewProjectService(local)
 
-	_, err = service.Create("tester", &CreateProjectRequest{
+	project, warning, err := service.Create("tester", &CreateProjectRequest{
 		Code:    "OPS-1",
 		Variant: "main",
 	})
-	if !errors.Is(err, ErrReservedMainVariant) {
-		t.Fatalf("expected ErrReservedMainVariant, got %v", err)
+	if err != nil {
+		t.Fatalf("create project: %v", err)
+	}
+	if warning == "" {
+		t.Fatalf("expected a warning about the reserved variant name")
+	}
+	if project.Variant == "" || normalizeProjectVariant(project.Variant) == "main" {
+		t.Fatalf("expected variant to be converted away from 'main', got %q", project.Variant)
 	}
 }
 
-func TestProjectServiceUpdateRejectsReservedMainVariant(t *testing.T) {
+// TestProjectServiceUpdateSanitizesReservedMainVariant mirrors the create case for
+// renaming an existing (non-main) variant to "main".
+func TestProjectServiceUpdateSanitizesReservedMainVariant(t *testing.T) {
 	local, err := newProjectTestLocalDB(t)
 	if err != nil {
 		t.Fatalf("open localdb: %v", err)
 	}
 	service := NewProjectService(local)
 
-	created, err := service.Create("tester", &CreateProjectRequest{
+	created, _, err := service.Create("tester", &CreateProjectRequest{
 		Code:    "OPS-1",
 		Variant: "Lenovo",
 	})
@@ -40,11 +50,41 @@ func TestProjectServiceUpdateRejectsReservedMainVariant(t *testing.T) {
 	}
 
 	mainName := "main"
-	_, err = service.Update(created.UUID, "tester", &UpdateProjectRequest{
+	updated, warning, err := service.Update(created.UUID, "tester", &UpdateProjectRequest{
 		Variant: &mainName,
 	})
-	if !errors.Is(err, ErrReservedMainVariant) {
-		t.Fatalf("expected ErrReservedMainVariant, got %v", err)
+	if err != nil {
+		t.Fatalf("update project: %v", err)
+	}
+	if warning == "" {
+		t.Fatalf("expected a warning about the reserved variant name")
+	}
+	if updated.Variant == "" || normalizeProjectVariant(updated.Variant) == "main" {
+		t.Fatalf("expected variant to be converted away from 'main', got %q", updated.Variant)
+	}
+}
+
+// TestSanitizeProjectVariantName_InvalidChars verifies disallowed characters are
+// stripped/replaced rather than rejected outright.
+func TestSanitizeProjectVariantName_InvalidChars(t *testing.T) {
+	sanitized, warning := sanitizeProjectVariantName("Лендинг сервер!")
+	if warning == "" {
+		t.Fatalf("expected a warning for invalid characters")
+	}
+	if !projectCodeRe.MatchString(sanitized) {
+		t.Fatalf("sanitized variant %q still fails projectCodeRe", sanitized)
+	}
+}
+
+// TestSanitizeProjectVariantName_ValidPassesThrough ensures already-valid names are
+// left untouched with no warning.
+func TestSanitizeProjectVariantName_ValidPassesThrough(t *testing.T) {
+	sanitized, warning := sanitizeProjectVariantName("lenovo-2u")
+	if warning != "" {
+		t.Fatalf("expected no warning, got %q", warning)
+	}
+	if sanitized != "lenovo-2u" {
+		t.Fatalf("expected unchanged variant, got %q", sanitized)
 	}
 }