release: add v0.0.18.1 multi-SDK builds

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Summary

• build IDASQL 0.0.18.1 against the exact IDA SDK tags for 9.2, 9.3, and 9.4
• always fetch standalone allthingsida/ida-cmake from main and reject an SDK-vendored copy
• add native Windows ARM64 builds for IDA 9.4 on windows-11-arm
• assemble one combined archive per IDA version:
  • idasql-v0.0.18.1-ida92.zip
  • idasql-v0.0.18.1-ida93.zip
  • idasql-v0.0.18.1-ida94.zip
• keep cli/ and plugin/ under each platform directory inside an archive
• gate release publication on the exact v0.0.18.1 tag

Compatibility

• use a four-component version across code, plugin metadata, and Windows resources
• restore the pre-IDA-9.3 bookmark lookup compatibility path required by SDK 9.2
• pin ordinary source dependencies for repeatability while deliberately leaving ida-cmake unpinned

Validation

Push CI run: https://github.com/allthingsida/idasql/actions/runs/30213728750

• all 10 matrix builds passed
• combined archive assembly and validation passed
• manifests identify version 0.0.18.1 and the correct IDA version
• package trees and SHA-256 checksums were independently rechecked after downloading the CI artifact
• binary headers verified as PE x86_64, PE ARM64, ELF x86_64, and Mach-O ARM64 as applicable
• every matrix row resolved ida-cmake commit 47f66b7046f8b292385cb9df3c4623c9d129c902

No tag or release has been created; the archives are ready for manual IDA 9.3/9.4 testing first.

Refs #54