Distributed capabilities extension for SharpCoreDB.

Version: v1.9.1
Package: SharpCoreDB.Distributed

• ✅ Aligned package metadata and version references to the synchronized 1.9.1 release line.
• ✅ Release automation now publishes all packable SharpCoreDB packages in CI/CD.

• Multi-master replication with vector clocks
• Distributed transaction components (2PC-oriented)
• Sharding and shard-routing abstractions
• Replication streaming coordination and monitoring primitives

• Package/docs synchronized to v1.9.0
• Distributed feature set aligned with current replication/transaction modules
• Documentation updated for enterprise distributed scenarios

dotnet add package SharpCoreDB.Distributed --version 1.9.0

• docs/INDEX.md
• src/SharpCoreDB.Distributed/NuGet.README.md