refactor: Remove Token management and integrate Redis for authentication

- Deleted the Token model and its repository, transitioning to a Redis-based token management system.
- Updated the service layer to utilize Redis for token storage, enhancing performance and scalability.
- Refactored the container to remove TokenRepository and integrate the new token service.
- Cleaned up the Dockerfile and other files by removing unnecessary whitespace and comments.
- Enhanced error handling and logging for Redis initialization and usage.

pkg/email/email_test.go

@@ -0,0 +1,56 @@
+package email
+
+import (
+	"strings"
+	"sync"
+	"testing"
+
+	"carrotskin/pkg/config"
+
+	"go.uber.org/zap"
+)
+
+func resetEmailOnce() {
+	serviceInstance = nil
+	once = sync.Once{}
+}
+
+func TestEmailManager_Disabled(t *testing.T) {
+	resetEmailOnce()
+	cfg := config.EmailConfig{Enabled: false}
+	if err := Init(cfg, zap.NewNop()); err != nil {
+		t.Fatalf("Init disabled err: %v", err)
+	}
+	svc := MustGetService()
+	if err := svc.SendVerificationCode("to@test.com", "123456", "email_verification"); err == nil {
+		t.Fatalf("expected error when disabled")
+	}
+}
+
+func TestEmailManager_SendFailsWithInvalidSMTP(t *testing.T) {
+	resetEmailOnce()
+	cfg := config.EmailConfig{
+		Enabled:  true,
+		SMTPHost: "127.0.0.1",
+		SMTPPort: 1, // invalid/closed port to trigger error quickly
+		Username: "user",
+		Password: "pwd",
+		FromName: "name",
+	}
+	_ = Init(cfg, zap.NewNop())
+	svc := MustGetService()
+	if err := svc.SendVerificationCode("to@test.com", "123456", "reset_password"); err == nil {
+		t.Fatalf("expected send error with invalid smtp")
+	}
+}
+
+func TestEmailManager_SubjectAndBody(t *testing.T) {
+	svc := &Service{cfg: config.EmailConfig{FromName: "name", Username: "user"}, logger: zap.NewNop()}
+	if subj := svc.getSubject("email_verification"); subj == "" {
+		t.Fatalf("subject empty")
+	}
+	body := svc.getBody("123456", "change_email")
+	if !strings.Contains(body, "123456") || !strings.Contains(body, "更换邮箱") {
+		t.Fatalf("body content mismatch")
+	}
+}