Replace manual IPC method mapping with Proxy-based approach.
Method names now automatically route to IPC channels,
eliminating the need to update this file when adding new APIs.
- Uses Proxy to intercept property access
- Static properties (platform) handled separately
- Supports variable argument counts via rest parameters
- Make name field optional (defaults to domain if empty)
- Simplify domain placeholder and error messages
- Add test connection button for credential validation before save