Add nickknissen.tableplus-command-palette to gallery

[nickknissen]

Extension Submission

Adds TablePlus to the Command Palette Extensions Gallery — surfaces saved TablePlus database connections inside Command Palette and launches them via the tableplus:// URI handler. Submitted in response to the invitation in #1.

• Repo: https://github.com/nickknissen/TablePlusCommandPalette
• Microsoft Store: https://apps.microsoft.com/detail/9P4L93228V63

Checklist

• My folder follows the <author>/<extension-name> convention (lowercase, alphanumeric + hyphens only)
• I have added an extension.json with all required fields
• The id field in my extension.json matches my folder path (author.extension-name)
• I have added an icon file (PNG or JPG, under 100 KB)
• The icon field in extension.json matches my icon filename
• My extension is available at the install source I specified (winget/MS Store/URL)
• I have read the Contributing Guide

Additional context

The screenshot was captured against a DEMO_MODE build so the listing doesn't leak any real connection names or hosts.

[niels9001]

LGTM!