GO-6131: Crypto: Add master node derivation API

[requilence]

Summary

• Add public API to derive keys from master nodes instead of requiring full mnemonic
• Enable serialization/deserialization of master nodes with chain code preservation
• Update go-slip10 dependency to support MarshalBinary/UnmarshalNode methods

Changes

• DeriveMasterNode() - derive master node from mnemonic at specified index
• DeriveKeysFromMasterNode() - derive master key and identity from master node
• DeriveMasterNodeFromSeed() - derive master node directly from seed
• Refactor internal derivation to use new public methods
• Add comprehensive tests for new functionality

Added new tests for:

• Master node derivation
• Serialization/deserialization with chain code
• Backward compatibility verification

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github.com/​anyproto/​go-slip10@​v1.0.0 ⏵ v1.0.1-0.20250818123350-f910c27dd080

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