Add direct and delegated Tron SignTransaction examples

[andrewkmin]

Summary

• add an executable Tron SignTransaction example that builds with TronWeb, signs through Turnkey, and broadcasts the serialized transaction
• add a delegated signer flow that configures a transfer-only active permission and signs with a key distinct from the transaction owner
• make the Tron examples honor BASE_URL, support unique wallet names, and report failed broadcasts accurately
• document the direct and delegated Nile testnet workflows and required environment variables

Why

This is the SDK companion to tkhq/mono#6939. It provides a repeatable way to exercise both supported Tron cases:

1. the transaction owner signs directly
2. the transaction owner delegates a Tron active permission to a different Turnkey key

The delegated example preserves the owner permission, restricts the delegated key to TransferContract, and validates the permission ID, signer weight, threshold, and operations bitmap before signing.

Validation

• TypeScript: tsc --noEmit
• Formatting: Prettier check
• Rebased onto current sdk/main
• Tested against a local mono stack running the branch for mono#6939
• Direct transfer confirmed on Nile: 797df713e834f88f0506d6620d7b8ca506b8cab172f5617255b22488c7a627ee
• Permission update confirmed on Nile: dd25e460d82ce72b6bade8b6e68c4f9afcb16c2daa270089358b7279e508e581
• Delegated transfer confirmed on Nile: 243f8be5d6d7d6e45dc53d2e5b7975252059da3994211a5a1ba9fd07b86c2cfc

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