test: add domain model tests

- Add Announcement.IsActiveAt tests (nil, status, time range)
- Add TableName tests for all domain models
- Domain package coverage: 9.2% -> 16.3%
- Overall coverage: 54.1% -> 54.2%

internal/domain/table_name_test.go

@@ -0,0 +1,122 @@
+package domain
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestAnnouncement_IsActiveAt 测试公告激活状态
+func TestAnnouncement_IsActiveAt(t *testing.T) {
+	now := time.Now()
+
+	tests := []struct {
+		name     string
+		announce *Announcement
+		expected bool
+	}{
+		{"nil", nil, false},
+		{"not active status", &Announcement{Status: AnnouncementStatusDraft}, false},
+		{"active no time", &Announcement{Status: AnnouncementStatusActive}, true},
+		{"before start", &Announcement{Status: AnnouncementStatusActive, StartsAt: timePtr(now.Add(time.Hour))}, false},
+		{"after end", &Announcement{Status: AnnouncementStatusActive, EndsAt: timePtr(now.Add(-time.Hour))}, false},
+		{"active in range", &Announcement{Status: AnnouncementStatusActive, StartsAt: timePtr(now.Add(-time.Hour)), EndsAt: timePtr(now.Add(time.Hour))}, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := tt.announce.IsActiveAt(now)
+			assert.Equal(t, tt.expected, got)
+		})
+	}
+}
+
+// TestCustomField_TableName 测试自定义字段表名
+func TestCustomField_TableName(t *testing.T) {
+	cf := CustomField{}
+	assert.Equal(t, "custom_fields", cf.TableName())
+}
+
+// TestUserCustomFieldValue_TableName 测试用户自定义字段值表名
+func TestUserCustomFieldValue_TableName(t *testing.T) {
+	cfv := UserCustomFieldValue{}
+	assert.Equal(t, "user_custom_field_values", cfv.TableName())
+}
+
+// TestDevice_TableName 测试设备表名
+func TestDevice_TableName(t *testing.T) {
+	d := Device{}
+	assert.Equal(t, "devices", d.TableName())
+}
+
+// TestLoginLog_TableName 测试登录日志表名
+func TestLoginLog_TableName(t *testing.T) {
+	ll := LoginLog{}
+	assert.Equal(t, "login_logs", ll.TableName())
+}
+
+// TestOperationLog_TableName 测试操作日志表名
+func TestOperationLog_TableName(t *testing.T) {
+	ol := OperationLog{}
+	assert.Equal(t, "operation_logs", ol.TableName())
+}
+
+// TestPasswordHistory_TableName 测试密码历史表名
+func TestPasswordHistory_TableName(t *testing.T) {
+	ph := PasswordHistory{}
+	assert.Equal(t, "password_histories", ph.TableName())
+}
+
+// TestPermission_TableName 测试权限表名
+func TestPermission_TableName(t *testing.T) {
+	p := Permission{}
+	assert.Equal(t, "permissions", p.TableName())
+}
+
+// TestRole_TableName 测试角色表名
+func TestRole_TableName(t *testing.T) {
+	r := Role{}
+	assert.Equal(t, "roles", r.TableName())
+}
+
+// TestRolePermission_TableName 测试角色权限表名
+func TestRolePermission_TableName(t *testing.T) {
+	rp := RolePermission{}
+	assert.Equal(t, "role_permissions", rp.TableName())
+}
+
+// TestSocialAccount_TableName 测试社交账号表名
+func TestSocialAccount_TableName(t *testing.T) {
+	sa := SocialAccount{}
+	assert.Equal(t, "user_social_accounts", sa.TableName())
+}
+
+// TestThemeConfig_TableName 测试主题配置表名
+func TestThemeConfig_TableName(t *testing.T) {
+	th := ThemeConfig{}
+	assert.Equal(t, "theme_configs", th.TableName())
+}
+
+// TestUserRole_TableName 测试用户角色表名
+func TestUserRole_TableName(t *testing.T) {
+	ur := UserRole{}
+	assert.Equal(t, "user_roles", ur.TableName())
+}
+
+// TestWebhook_TableName 测试 Webhook 表名
+func TestWebhook_TableName(t *testing.T) {
+	w := Webhook{}
+	assert.Equal(t, "webhooks", w.TableName())
+}
+
+// TestWebhookDelivery_TableName 测试 Webhook 投递表名
+func TestWebhookDelivery_TableName(t *testing.T) {
+	wd := WebhookDelivery{}
+	assert.Equal(t, "webhook_deliveries", wd.TableName())
+}
+
+// timePtr 辅助函数
+func timePtr(t time.Time) *time.Time {
+	return &t
+}