[DOC] update download page for 26.04.1 hot release [skip ci]

[viadea]

Bump the download page from v26.04.0 to v26.04.1 and add the v26.04.0 section to the archived releases page.

v26.04.1 is a hotfix release on top of v26.04.0:

• Fix unregister/remove path for the wrapped shuffle resolver to prevent stale shuffle files from accumulating, which could cause "No space left on device" on long running jobs ([BUG] Fix unregister/remove path for wrapped shuffle resolver #14686, [BUG] NDS-H SF1K single-node benchmark fails with java.io.IOException: No space left on device #14683).
• Rebuild against the latest Databricks 17.3 ML LTS runtime to resolve a NoSuchMethodError on CatalogTable.copy in GpuCreateDataSourceTableAsSelectCommand ([BUG] [DB-17.3 IT agaist v26.04.0] NoSuchMethodError on CatalogTable.copy in GpuCreateDataSourceTableAsSelectCommand #14682).

Documentation

• Updated for new or modified user-facing features or behaviors
• No user-facing change

Testing

• Added or modified tests to cover new code paths
• Covered by existing tests
  (Please provide the names of the existing tests in the PR description.)
• Not required

Performance

• Tests ran and results are added in the PR description
• Issue filed with a link in the PR description
• Not required

[greptile-apps]

Greptile Summary

This PR updates the download page to promote v26.04.1 as the current release and moves the v26.04.0 section to the archive. All download links, Maven coordinates, GPG verification commands, and release notes are consistently updated to the new version, and the hotfix context is clearly explained.

Confidence Score: 5/5

Safe to merge — documentation-only change with no code impact.

All version strings, URLs, Maven coordinates, and GPG commands are consistently updated to v26.04.1 in download.md, and the v26.04.0 section is correctly added to archive.md. No code, configuration, or build artifacts are touched.

No files require special attention.

Important Files Changed

Filename	Overview
docs/download.md	Updated current release section from v26.04.0 to v26.04.1, refreshing all download links, Maven coordinates, GPG verify commands, and release notes with hotfix details.
docs/archive.md	Added new v26.04.0 archived release section with hardware/software requirements, download tables (CUDA 12 & 13, x86_64 & arm64, Scala 2.12 & 2.13), and release notes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User visits docs] --> B{Which page?}
    B --> C[download.md]
    B --> D[archive.md]
    C --> E[Current release: v26.04.1\nCUDA 12 & 13 jars\nx86_64 & arm64\nScala 2.12 & 2.13]
    D --> F[Archived: v26.04.0\nCUDA 12 & 13 jars\nx86_64 & arm64\nScala 2.12 & 2.13]
    D --> G[Older archived releases\nv26.02.2 and below]

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