fix: contain backup archive extraction paths - #3500
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Issue Number (if Applicable): Fixes CW-1607
Description
Adds one shared archive-entry path guard and applies it before every V1, V2, and V3 backup extraction write. POSIX and Windows absolute paths, traversal segments in either syntax, empty names, and normalized destinations outside the app directory are rejected before filesystem mutation.
Validation
test/core/backup_service_test.dart: 4 passed