feat(nostr): switch to gift-wrapped events

[tionis]

Summary

The old implementation used the old soft-deprecated NIP-04 format for private DMs.
This PR changes it to use NIP-17 which uses gift-wrapped events to hide metadata, specifically who is writing to whom. This prevents leaking metadata about the uptime kuma instance to the public via the nostr relays.

Please follow this checklist to avoid unnecessary back and forth (click to expand)

• ⚠️ If there are Breaking change (a fix or feature that alters existing functionality in a way that could cause issues) I have called them out
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• 🔍 Any UI changes adhere to visual style of this project.
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• 🤖 I added or updated automated tests where appropriate.
• 📄 Documentation updates are included (if applicable).
• 🧰 Dependency updates are listed and explained.
• ⚠️ CI passes and is green.

[github-actions]

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[Copilot]

Pull request overview

This PR updates the Nostr notification provider to use NIP-17 gift-wrapped events (via NIP-59) instead of the deprecated NIP-04 format for private direct messages. This change enhances privacy by hiding metadata about sender/recipient relationships from public relays.

Changes:

• Switched from NIP-04 encrypted direct messages to NIP-17 private direct messages with NIP-59 gift wrapping
• Simplified Node.js version-specific polyfill code to only handle WebSocket
• Updated nostr-tools dependency from v2.10.4 to v2.17.0

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
server/notification-providers/nostr.js	Replaced NIP-04 encryption with NIP-59 gift-wrapped events and removed version-specific crypto polyfills
package.json	Updated nostr-tools dependency to v2.17.0 to support NIP-59 functionality

[CommanderStorm]

I don't know what this code is doing precisely, but I trust You to know what you are doing there.

Could you share a screenshot of this working?

[tionis]

Sure, I tested it using an android app for nostr DMs as other clients completely ignore NIP-04 DMs (the older format used before this PR).

Testing NIP-04 nostr notifications (the old setup)

The message received in the 0xchat app (with the warning).	The warning popup when clicking on the yellow i.

Testing NIP-17 nostr notifications (the new setup)

The setup interface during testing	The message received in the 0xchat app.

Is there anything else you need? The change is a bit difficult to show in a screenshot as its purely internal/on the protocol level.

[CommanderStorm]

Thanks

[CommanderStorm]

FYI: if you want to use this, it is in our next nightly release.