- Simplify McpFormModal to 3 inputs: title (required), description (optional), and JSON config (optional)
- Add JSON validation similar to ProviderForm (must be object, real-time error display)
- Create McpWizardModal component for quick configuration:
- 5 input fields: type (stdio/sse), command (required), args, cwd, env
- Real-time JSON preview
- Emerald theme color (consistent with MCP button)
- Z-index 70 (above McpFormModal's 60)
- Add "or use configuration wizard" link next to JSON config label
- Update i18n translations (zh/en) for form and wizard
- All changes pass TypeScript typecheck and Prettier formatting
