feat(notify): add percentage threshold type for balance low notification

- Add threshold_type field (fixed/percentage) to system and user settings
- Add total_recharged field to users table, auto-incremented on balance credit
- Percentage mode: effective threshold = total_recharged × percentage / 100
- User-level threshold_type inherits from system default when not set
- Update admin settings UI with radio selector (fixed amount / percentage)
- Migration: 102_add_balance_notify_threshold_type.sql

backend/ent/user_update.go

@@ -257,6 +257,20 @@ func (_u *UserUpdate) SetNillableBalanceNotifyEnabled(v *bool) *UserUpdate {
 	return _u
 }
 
+// SetBalanceNotifyThresholdType sets the "balance_notify_threshold_type" field.
+func (_u *UserUpdate) SetBalanceNotifyThresholdType(v string) *UserUpdate {
+	_u.mutation.SetBalanceNotifyThresholdType(v)
+	return _u
+}
+
+// SetNillableBalanceNotifyThresholdType sets the "balance_notify_threshold_type" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableBalanceNotifyThresholdType(v *string) *UserUpdate {
+	if v != nil {
+		_u.SetBalanceNotifyThresholdType(*v)
+	}
+	return _u
+}
+
 // SetBalanceNotifyThreshold sets the "balance_notify_threshold" field.
 func (_u *UserUpdate) SetBalanceNotifyThreshold(v float64) *UserUpdate {
 	_u.mutation.ResetBalanceNotifyThreshold()
@@ -298,6 +312,27 @@ func (_u *UserUpdate) SetNillableBalanceNotifyExtraEmails(v *string) *UserUpdate
 	return _u
 }
 
+// SetTotalRecharged sets the "total_recharged" field.
+func (_u *UserUpdate) SetTotalRecharged(v float64) *UserUpdate {
+	_u.mutation.ResetTotalRecharged()
+	_u.mutation.SetTotalRecharged(v)
+	return _u
+}
+
+// SetNillableTotalRecharged sets the "total_recharged" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableTotalRecharged(v *float64) *UserUpdate {
+	if v != nil {
+		_u.SetTotalRecharged(*v)
+	}
+	return _u
+}
+
+// AddTotalRecharged adds value to the "total_recharged" field.
+func (_u *UserUpdate) AddTotalRecharged(v float64) *UserUpdate {
+	_u.mutation.AddTotalRecharged(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdate) AddAPIKeyIDs(ids ...int64) *UserUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -804,6 +839,9 @@ func (_u *UserUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.BalanceNotifyEnabled(); ok {
 		_spec.SetField(user.FieldBalanceNotifyEnabled, field.TypeBool, value)
 	}
+	if value, ok := _u.mutation.BalanceNotifyThresholdType(); ok {
+		_spec.SetField(user.FieldBalanceNotifyThresholdType, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.BalanceNotifyThreshold(); ok {
 		_spec.SetField(user.FieldBalanceNotifyThreshold, field.TypeFloat64, value)
 	}
@@ -816,6 +854,12 @@ func (_u *UserUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.BalanceNotifyExtraEmails(); ok {
 		_spec.SetField(user.FieldBalanceNotifyExtraEmails, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.TotalRecharged(); ok {
+		_spec.SetField(user.FieldTotalRecharged, field.TypeFloat64, value)
+	}
+	if value, ok := _u.mutation.AddedTotalRecharged(); ok {
+		_spec.AddField(user.FieldTotalRecharged, field.TypeFloat64, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1518,6 +1562,20 @@ func (_u *UserUpdateOne) SetNillableBalanceNotifyEnabled(v *bool) *UserUpdateOne
 	return _u
 }
 
+// SetBalanceNotifyThresholdType sets the "balance_notify_threshold_type" field.
+func (_u *UserUpdateOne) SetBalanceNotifyThresholdType(v string) *UserUpdateOne {
+	_u.mutation.SetBalanceNotifyThresholdType(v)
+	return _u
+}
+
+// SetNillableBalanceNotifyThresholdType sets the "balance_notify_threshold_type" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableBalanceNotifyThresholdType(v *string) *UserUpdateOne {
+	if v != nil {
+		_u.SetBalanceNotifyThresholdType(*v)
+	}
+	return _u
+}
+
 // SetBalanceNotifyThreshold sets the "balance_notify_threshold" field.
 func (_u *UserUpdateOne) SetBalanceNotifyThreshold(v float64) *UserUpdateOne {
 	_u.mutation.ResetBalanceNotifyThreshold()
@@ -1559,6 +1617,27 @@ func (_u *UserUpdateOne) SetNillableBalanceNotifyExtraEmails(v *string) *UserUpd
 	return _u
 }
 
+// SetTotalRecharged sets the "total_recharged" field.
+func (_u *UserUpdateOne) SetTotalRecharged(v float64) *UserUpdateOne {
+	_u.mutation.ResetTotalRecharged()
+	_u.mutation.SetTotalRecharged(v)
+	return _u
+}
+
+// SetNillableTotalRecharged sets the "total_recharged" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableTotalRecharged(v *float64) *UserUpdateOne {
+	if v != nil {
+		_u.SetTotalRecharged(*v)
+	}
+	return _u
+}
+
+// AddTotalRecharged adds value to the "total_recharged" field.
+func (_u *UserUpdateOne) AddTotalRecharged(v float64) *UserUpdateOne {
+	_u.mutation.AddTotalRecharged(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdateOne) AddAPIKeyIDs(ids ...int64) *UserUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -2095,6 +2174,9 @@ func (_u *UserUpdateOne) sqlSave(ctx context.Context) (_node *User, err error) {
 	if value, ok := _u.mutation.BalanceNotifyEnabled(); ok {
 		_spec.SetField(user.FieldBalanceNotifyEnabled, field.TypeBool, value)
 	}
+	if value, ok := _u.mutation.BalanceNotifyThresholdType(); ok {
+		_spec.SetField(user.FieldBalanceNotifyThresholdType, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.BalanceNotifyThreshold(); ok {
 		_spec.SetField(user.FieldBalanceNotifyThreshold, field.TypeFloat64, value)
 	}
@@ -2107,6 +2189,12 @@ func (_u *UserUpdateOne) sqlSave(ctx context.Context) (_node *User, err error) {
 	if value, ok := _u.mutation.BalanceNotifyExtraEmails(); ok {
 		_spec.SetField(user.FieldBalanceNotifyExtraEmails, field.TypeString, value)
 	}
+	if value, ok := _u.mutation.TotalRecharged(); ok {
+		_spec.SetField(user.FieldTotalRecharged, field.TypeFloat64, value)
+	}
+	if value, ok := _u.mutation.AddedTotalRecharged(); ok {
+		_spec.AddField(user.FieldTotalRecharged, field.TypeFloat64, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,