Add a command palette ( / or ⌘K) for quick navigation across assets, people, and menus

[yoonhyunwoo]

GLPI navigation today means drilling through the multi-level menu or using the global search page.
The existing "Find menu" fuzzy modal (Ctrl+Alt+G) only jumps to menu pages
it can't jump to a specific asset, user, or software, which is the most common "I know the name, take me there" need.

Proposal
Extend the existing FuzzySearch modal into a unified command palette:

• Triggered by / and Ctrl/⌘+K (plus the existing sidebar button).
• Searches assets, people, and software by name + the existing menu fuzzy results, grouped by type.
• Keyboard-navigable (↑↓/Enter), with recents and a "full search →" fallback to the current global search page for comprehensive matches.

A working implementation demo exists on yoonhyunwoo:feature/command-palette.

demo.mov

Prior art
No existing issue/PR found for a command palette;
Happy to open a PR after discussion on scope/UX.

[yoonhyunwoo]

@orthagh This is unrelated, but it looks like the discussion is getting spammed..

[orthagh]

Thank you for the ping.
I deleted all spams (manually because Github doesn't bother to ship moderation features...)