Gregory Bednov dae1cd484e Add ER diagram and schema docs, enhance tx validation ...

Added ER.svg and database_schema.md to document the logical data model. Refactored and extended transaction validation in blockchain/abci.go to enforce ID prefix rules, entity existence, and uniqueness for promises, commitments, commiters, and beneficiaries. Updated lbc_sdk dependency version in go.mod and go.sum.

2025-08-10 22:39:28 +03:00

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