server i18n: move inline HTML to templates.go, localize all handler strings
- Admin & user dashboard HTML moved from handlers to templates.go with i18n.T()
- SafeVaultPath applied in sync_apply.go (note/file create/update, blob restore)
- DeleteNode/RenameNode/MoveNode fixed: correct activity type / entity variant
- Added TypeNoteDeleted, TypeNodeDeleted, TypeFolderMoved activity constants
- Added locale() helper on Server struct, removed hardcoded 'ru' in handlers
- Password policy loosened: 8-256 chars, any characters, machine-readable error codes
- check-i18n.sh: Go Cyrillic = FAIL with explicit exception list, Go locale key consistency check
mirivlad
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