Add Quick Actions v3 Action Function

[CallSohail]

Adds Quick Actions 3.0.0 under functions/actions/quick-actions/.

Highlights:

• compact context-aware action menu for assistant responses
• Understand, Rewrite, Humanize, Verify, Create, Explore, Code, Data, Study, and Utility actions
• English and French built-in UI, dialogs, and prompts
• admin Team actions and per-user My actions
• dynamic {input} / {input:Label} custom actions
• preview/send modes with unsent-draft protection
• older-message targeting with bounded fingerprints
• responsive light/dark desktop and mobile UI
• action-specific SVG icons and safer fixed browser-side code
• repository/action indexes and changelogs updated
• CI validation for Python syntax, catalog coverage, custom actions, unsafe dynamic-JS patterns, and generated JavaScript syntax

Target compatibility: Open WebUI 0.11.1+.