feat: add DIP-17 Platform Address Funding key support

[pauldelucia]

Add PlatformAddressFunding account type for DIP-17 funding keys with derivation path m/9'/coin_type'/17'/0'/2'/index. This enables wallets to generate funding addresses for Platform operations.

Changes:

• Add DerivationPathReference::PlatformAddressFunding (value 17)
• Add platform_address_funding_path() helper in bip32.rs
• Add AccountType::PlatformAddressFunding variant
• Add ManagedAccountType::PlatformAddressFunding with address pool
• Update transaction router to check PlatformAddressFunding for AssetLock
• Add FFI bindings for platform address funding functionality

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/dip17-platform-address-funding

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[github-actions]

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.