Add OwlCloud - DiceCloud Character Sync Extension

[CarmaNayeli]

This PR adds OwlCloud to the Owlbear Rodeo extension store.

Extension Details:

• Name: OwlCloud - DiceCloud Character Sync
• Author: Carmabella
• Manifest: https://carmaclouds.vercel.app/extension/owlbear-extension/manifest.json
• Store Page: https://carmaclouds.vercel.app/owlcloud-extension.md

Description:
OwlCloud seamlessly syncs DiceCloud V2 characters to Owlbear Rodeo with cloud storage via Supabase. Part of the CarmaClouds ecosystem that also supports Roll20 and Foundry VTT.

Features:

• One-click character sync from DiceCloud
• Cloud storage for access anywhere
• Full character data import (stats, skills, spells, inventory)
• Real-time updates across devices

The markdown file includes all required frontmatter and detailed documentation per the extension submission guidelines.

[Several-Record7234]

Hi @CarmaNayeli,

I've just run first-stage extension verification on your submission, and it failed on the following points:

1. "tags" must be one of [dice, fog, tool, content-pack, drawing, audio, combat, automation, other] - please select from the list of options.
2. the link to your hero image (https://carmaclouds.vercel.app/owlcloud-hero.png) is giving a 404 error in my browser

Let me know when you've resolved these, and I will re-run verification for you, thanks!