feat(chat): add SvelteKit web app with full feature parity to mobile

Web app features:
- Auth: Login, Register, Forgot Password with shared-auth-ui
- Chat: New chat, conversation view, message list, model selector
- Templates: List, create, edit, delete templates
- Spaces: Team workspaces with member management
- Documents: Document mode with version history
- Archive & Profile pages

Technical:
- SvelteKit 2 with Svelte 5 runes
- Tailwind CSS 4 with shared themes
- Supabase Auth with SSR
- ChatLogo added to shared-branding
- dev:*:app commands for web+backend

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -7,6 +7,7 @@ packages:
   - 'picture'
   - 'uload'
   - 'chat'
+  - 'nutriphi'
 
   # Sub-apps within projects
   - 'maerchenzauber/apps/*'
@@ -21,6 +22,8 @@ packages:
   - 'chat/apps/*'
   - 'chat/backend'
   - 'chat/packages/*'
+  - 'nutriphi/apps/*'
+  - 'nutriphi/backend'
 
   # Shared packages
   - 'packages/*'