Add SwapExecutor support and use it for swap execution

[fengtality]

Summary

• Add swap_executor guide with full documentation
• Update manage_gateway_swaps execute action to use swap_executor instead of direct gateway calls
• Add swap_executor to executor types and preferences template
• Add account_name parameter to GatewaySwapRequest schema

Key Changes

Gateway Swap Execute → SwapExecutor

The execute action now creates a swap_executor instead of calling the gateway swap endpoint directly. This provides:

• Retry logic: Automatic retries for transaction timeouts and price movement
• Tracking: Executor shows in executor list with status, tx_hash, executed_price
• Consistency: Same pattern as other executor types

Connector Format

Updated documentation to use jupiter/router format for Gateway router connectors.

Dependencies

• Requires: Add SwapExecutor for Gateway AMM swaps with retry logic hummingbot#8117
• Requires: Add SwapExecutor support hummingbot-api#136

Test plan

• Execute swap via MCP tool
• Verify swap_executor is created
• Verify custom_info contains tx_hash, executed_price

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