Update OpenCloud web extension tags to latest available releases

[Copilot]

The chart’s default web extension versions were stale, and draw-io in particular needed to move to 2.0.0. This PR refreshes all currently configured web extension tags to the latest available versions and keeps chart docs aligned with runtime defaults.

• Web extension version updates (charts/opencloud/values.yaml)

  • Updated enabled extension tags to latest available images:
    • draw-io-2.0.0
    • external-sites-2.0.0
    • json-viewer-2.0.0
    • progress-bars-2.0.0
    • unzip-2.0.0
  • Left extensions unchanged where configured tag is already latest (importer, arcade, calculator, cast, maps, pastebin).

• Documentation sync (charts/opencloud/README.md)

  • Updated the Web Extensions defaults table so documented tags match chart defaults.

• Example of resulting defaults

  webExtensions:
    extensions:
      drawio:
        enabled: true
        tag: draw-io-2.0.0
      externalsites:
        enabled: true
        tag: external-sites-2.0.0
      jsonviewer:
        enabled: true
        tag: json-viewer-2.0.0

[Copilot]

Pull request overview

This PR refreshes the default OpenCloud web extension image tags in the Helm chart and keeps the chart README defaults table aligned with those runtime defaults.

Changes:

• Bumps enabled web extension tags for Draw.io, External Sites, JSON Viewer, Progress Bars, and Unzip to 2.0.0.
• Updates README default values for the same web extension tags.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
charts/opencloud/values.yaml	Updates default web extension image tags used by the chart.
charts/opencloud/README.md	Synchronizes documented web extension defaults with values.yaml.

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