forward unencrypted 1756 to push notifications

[ice-cronus]

No description provided.

[Copilot]

Pull request overview

This PR adds push-notification support for unencrypted Custom ION kind 1756 (CustomIONKindFundSendNotify) events by treating them as an anonymous payment received notification, and relaxes validation to accept these events without an on-behalf-of (b) tag.

Changes:

• Update validation rules for CustomIONKindFundSendNotify to make model.CustomIONTagOnBehalfOf optional.
• Add a new push notification type/translation and route kind 1756 events to a new handler (handleAnonymousFundSendEvent).
• Bump indirect dependencies (github.com/lib/pq, github.com/sasha-s/go-deadlock).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
validation/validate.go	Loosens required tags for kind 1756 to allow missing b tag.
push-notifications/pushnotifications.go	Adds anonymous payment notification type/translation and dispatches kind 1756 to a new handler.
push-notifications/notification_funds_transfer.go	Implements handler to generate notifications for kind 1756 using p as recipient.
push-notifications/notification_funds_transfer_test.go	Adds unit test for the new handler logic.
go.mod	Bumps indirect dependency versions.
go.sum	Updates checksums for bumped dependencies.

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