Real-Currents IPFS integration

[dancingfrog]

Integrates IPFS/IPNS capabilities into the Real-Currents site to provide immutable snapshots and stable, updateable pointers while maintaining HTTP compatibility.

This PR implements a 3-tier IPFS integration:

1. Worker (VPS): Runs Kubo (IPFS daemon) + Caddy (reverse proxy with auth).
2. Security Guard/Gateway (Gandi Node.js): Custom Next.js server handling live site, IPFS/IPNS gateway, and deployment APIs.
3. Producer (GitHub Actions): Automates build, deployment to Gandi, snapshotting to IPFS, and IPNS updates.

It introduces /ipfs/<cid>/... for immutable content and /ipns/<name>/... for stable, updateable pointers, alongside the existing Next.js routes.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[dancingfrog]

@cursoragent Please resolve conflicts in:
https://patch-diff.githubusercontent.com/raw/Real-Currents/Real-Currents.github.io/pull/33.patch

[cursor]

Merge conflicts are resolved. Summary:

Conflicts Resolved

File: src/app/page.tsx

Cause: The branch had commits that added the "Information architecture in the [Augmented|Virtual|eXtended] Reality Age" post, while main had added "WebXR Layers Start!" as the first post.

Resolution: Both posts are kept, in date order (newest first):

1. WebXR Layers Start! (2025-09-18) – from main
2. Information architecture in the [Augmented|Virtual|eXtended] Reality Age (2025-09-11) – with the updated description from the publish commit
3. Other posts unchanged (Democratizing analytics, Three.js Portal Effect, etc.)

The Three.js Portal Effect description was updated to: "A demo of how to use clipping planes to construct/project WebXR scenes in mixed reality - through the portal!"

The branch was rebased onto main and force-pushed. The PR should now be mergeable without conflicts.