Add Curly plugin

[Foundasys]

This PR adds Curly, a template-filling plugin for text documents (EditorsSupport: ["word"]).

Curly lets teams turn the documents they send out all the time (contracts, quotes, invoices…) into reusable templates: mark the changing parts with {tags}, then fill them from the task pane and get a finished, ready-to-send copy.

A few notes for review:

• The task pane is a compiled React app (bundle/addin.js); it communicates only with our backend at https://curly.io (licensing + template API) — no third-party calls.
• Curly is a commercial product (like DeepL/Zoom in the store), but reviewers can test the full flow without leaving the editor: the pane offers a free 14-day trial — enter an email, receive a 6-digit code, done. No credit card, no browser switch.
• Tested on ONLYOFFICE Desktop Editors (Windows) and Document Server via Docker, including header/footer tag scanning.
• Store assets follow the translator/drawio conventions (28px icon ladder, 120×60 store icons, 2480×1416 screenshots).

Plugin folder: sdkjs-plugins/content/curly/ · Store entry appended to store/config.json. Discussion issue: #607.

[CLAassistant]

All committers have signed the CLA.

[drape3a]

Hi @Foundasys Thank you for your contribution!

Please add "offered" to config.json. Optionally, you can also include translations/langs.json and CHANGELOG.md.

Also, please check that the plugin displays correctly in the dark theme.

[Foundasys]

Done — added "offered": "Foundasys" and a CHANGELOG.md.

While at it: icons2 now ships light and dark ribbon icon styles (drawio-style resources/light|dark/ folders), so the icon keeps contrast on the dark theme.

On translations/langs.json: skipped deliberately — the task pane localizes at runtime (the app ships its own i18n; store-facing text is covered by descriptionLocale). Happy to add it if you'd prefer it regardless.

Thanks for the quick review!