Add external asset hosting for Chromatic image rendering

Migrate Gitea remotes to git.tensordesign.com.au. Add assetUrl() utility
that resolves image paths from Gitea ParsonsAssets repo when
STORYBOOK_ASSET_BASE is set, enabling images on Chromatic-published
Storybook while keeping local dev unchanged via staticDirs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -28,6 +28,9 @@ docs/reference/how-to-work-with-both-tools.md
 docs/reference/mcp-setup.md
 docs/reference/retroactive-review-plan.md
 
+# Deploy scripts (contain credentials)
+scripts/
+
 # Build logs
 build-storybook.log