Daniel Akulenok 4151c9a8c3 docs: Add BIND9 grammar files for v9.18.44 and v9.20.18 ...

- Fetch official BIND9 configuration grammar files from Gitea mirror
- v9.18.44: Complete grammar including delegation-only.zoneopt
- v9.20.18: Grammar files with v9.20 specific syntax updates
- Files organized in upstream/vX.Y.Z/grammar/ directory structure
- Enables configuration validation and version comparison tooling
- Supports documentation generation and compatibility checking

2026-02-07 23:31:04 +01:00

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