Add complete setup wizard implementation with the following features:
- Welcome step with feature highlights
- Environment check step with Node.js, OpenClaw, and Gateway verification
- AI Provider selection with API key input and validation UI
- Channel connection step with QR code placeholder
- Skill bundle selection with recommended bundles pre-selected
- Completion summary showing all configured options
Additional changes:
- Add setupComplete state and markSetupComplete action to settings store
- Auto-redirect to setup wizard on first launch
- Track setup completion in persisted settings
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