* feat: Add Azure DNS metadata (tags) support
* fix: address PR review comments for Azure metadata support
* test: add Azure metadata annotation test cases and fix prefix initialization
* Replace azure-metadata-* annotations with azure-tags
* refactor: move Azure tags parsing to provider package
Move provider-specific Azure tags annotation parsing from
source/annotations to provider/azure, following the same
pattern as Cloudflare tags handling.
* fix: use GetProviderSpecificProperty and handle duplicate tags
* fix: align with upstream Go 1.26 migration and short-form property names