Add OpenAPI docs, frontend, migrations, and API updates

- OpenAPI: add missing endpoints (add-from-url, subscriptions, public availability)
- OpenAPI: CalendarSubscription schema, Subscriptions tag
- Frontend app
- Migrations: count_for_availability, subscriptions_sync, user_preferences, calendar_settings
- Config, rate limit, auth, calendar, booking, ICS, availability, user service updates

Made-with: Cursor

internal/service/user.go

@@ -33,16 +33,41 @@ func (s *UserService) GetMe(ctx context.Context, userID uuid.UUID) (*models.User
 	return &user, nil
 }
 
-func (s *UserService) Update(ctx context.Context, userID uuid.UUID, timezone *string) (*models.User, error) {
-	if timezone != nil {
-		if err := utils.ValidateTimezone(*timezone); err != nil {
+type UserUpdateInput struct {
+	Timezone                    *string
+	WeekStartDay                *int
+	DateFormat                  *string
+	TimeFormat                  *string
+	DefaultEventDurationMinutes *int
+	DefaultReminderMinutes      *int
+	ShowWeekends                *bool
+	WorkingHoursStart           *string
+	WorkingHoursEnd             *string
+	NotificationsEmail          *bool
+}
+
+func (s *UserService) Update(ctx context.Context, userID uuid.UUID, in *UserUpdateInput) (*models.User, error) {
+	if in == nil {
+		in = &UserUpdateInput{}
+	}
+	if in.Timezone != nil {
+		if err := utils.ValidateTimezone(*in.Timezone); err != nil {
 			return nil, err
 		}
 	}
 
 	u, err := s.queries.UpdateUser(ctx, repository.UpdateUserParams{
-		ID:       utils.ToPgUUID(userID),
-		Timezone: utils.ToPgTextPtr(timezone),
+		ID:                          utils.ToPgUUID(userID),
+		Timezone:                    utils.ToPgTextPtr(in.Timezone),
+		WeekStartDay:                utils.ToPgInt2Ptr(in.WeekStartDay),
+		DateFormat:                  utils.ToPgTextPtr(in.DateFormat),
+		TimeFormat:                  utils.ToPgTextPtr(in.TimeFormat),
+		DefaultEventDurationMinutes: utils.ToPgInt4Ptr(in.DefaultEventDurationMinutes),
+		DefaultReminderMinutes:      utils.ToPgInt4Ptr(in.DefaultReminderMinutes),
+		ShowWeekends:                utils.ToPgBoolPtr(in.ShowWeekends),
+		WorkingHoursStart:           utils.ToPgTextPtr(in.WorkingHoursStart),
+		WorkingHoursEnd:             utils.ToPgTextPtr(in.WorkingHoursEnd),
+		NotificationsEmail:         utils.ToPgBoolPtr(in.NotificationsEmail),
 	})
 	if err != nil {
 		if err == pgx.ErrNoRows {