fix: sort image tags with version-aware newest-first ordering

[Abhineshhh]

Summary

• Replace reverse lexicographic tag sort in FilterTags with version-aware newest-first ordering
• Leading numeric segments (major.minor.patch…) are compared so 10.0 ranks above 9.0
• Ensures --max-tags / LimitTags keeps the newest releases instead of dropping them

Fixes #66

Test plan

• go test ./pkg/infrastructure/scanner/ -count=1
• New tests: TestFilterTags_VersionAwareNewestFirst, TestSortTagsNewestFirst, TestVersionPrefix
• Existing TestFilterTags / TestLimitTags still pass

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[Abhineshhh]

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