DEX pallets (tokenWrapper, assets, assetConversion) are deployed on
Asset Hub teyrchain, not on the relay chain. Updated all DEX modals
to use assetHubApi instead of relay chain api:
- InitializeHezPoolModal: HEZ → wHEZ wrapping via Asset Hub
- InitializeUsdtModal: wUSDT minting via Asset Hub
- CreatePoolModal: Pool creation via Asset Hub
- XCMConfigurationWizard: Steps 5-6 use Asset Hub API
Added pallet availability checks with user-friendly error messages.