Add NoOp email service, /docs shortcut and fix streak timezone bug

Replace nil email service pattern with NoOpEmailService (Null Object)
to eliminate nil pointer panics across all handlers.

Add /docs route as a shortcut to Swagger UI.

Fix streak calculation returning 0 when server timezone differs from
UTC — CreatedAt was not converted to UTC before date extraction.

internal/infrastructure/email/smtp_service.go

@@ -107,6 +107,10 @@ func (s *SMTPService) GetConfig() SMTPConfig {
 	return s.config
 }
 
+func (s *SMTPService) IsEnabled() bool {
+	return true
+}
+
 func (s *SMTPService) HealthCheck() error {
 	dialer := mail.NewDialer(s.config.Host, s.config.Port, s.config.Username, s.config.Password)
 	dialer.TLSConfig = &tls.Config{

internal/infrastructure/http/integration_test.go

@@ -11,6 +11,7 @@ import (
 
 	"apocapoc-api/internal/application/commands"
 	"apocapoc-api/internal/application/queries"
+	"apocapoc-api/internal/domain/services"
 	"apocapoc-api/internal/i18n"
 	"apocapoc-api/internal/infrastructure/auth"
 	"apocapoc-api/internal/infrastructure/crypto"
@@ -43,14 +44,15 @@ func setupTestServer(t *testing.T) *TestServer {
 	refreshTokenRepo := sqlite.NewRefreshTokenRepository(db)
 	passwordResetTokenRepo := sqlite.NewPasswordResetTokenRepository(db)
 
-	registerHandler := commands.NewRegisterUserHandler(userRepo, passwordHasher, nil, "", "open", false)
+	noOpEmail := &services.NoOpEmailService{}
+	registerHandler := commands.NewRegisterUserHandler(userRepo, passwordHasher, noOpEmail, "", "open", false)
 	loginHandler := queries.NewLoginUserHandler(userRepo, passwordHasher)
 	refreshTokenHandler := queries.NewRefreshTokenHandler(refreshTokenRepo, userRepo)
 	revokeTokenHandler := commands.NewRevokeTokenHandler(refreshTokenRepo)
 	revokeAllTokensHandler := commands.NewRevokeAllTokensHandler(refreshTokenRepo)
-	verifyEmailHandler := commands.NewVerifyEmailHandler(userRepo, nil, false)
-	resendVerificationEmailHandler := commands.NewResendVerificationEmailHandler(userRepo, nil, "")
-	requestPasswordResetHandler := commands.NewRequestPasswordResetHandler(userRepo, passwordResetTokenRepo, nil, "")
+	verifyEmailHandler := commands.NewVerifyEmailHandler(userRepo, noOpEmail, false)
+	resendVerificationEmailHandler := commands.NewResendVerificationEmailHandler(userRepo, noOpEmail, "")
+	requestPasswordResetHandler := commands.NewRequestPasswordResetHandler(userRepo, passwordResetTokenRepo, noOpEmail, "")
 	resetPasswordHandler := commands.NewResetPasswordHandler(userRepo, passwordResetTokenRepo, passwordHasher)
 	createHandler := commands.NewCreateHabitHandler(habitRepo)
 	getTodaysHandler := queries.NewGetTodaysHabitsHandler(habitRepo, entryRepo)

internal/infrastructure/http/router.go

@@ -30,6 +30,9 @@ func NewRouter(appURL string, habitHandlers *HabitHandlers, authHandlers *AuthHa
 		AllowCredentials: true,
 	}))
 
+	r.Get("/docs", httpSwagger.Handler(
+		httpSwagger.URL("/api/v1/docs/doc.json"),
+	))
 	r.Get("/api/v1/docs", func(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, "/api/v1/docs/index.html", http.StatusMovedPermanently)
 	})