Preserve special filesystem subpaths as wire strings - #33107
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## Why Special filesystem subpaths can contain relative or foreign-platform path spellings. Treating this wire text as a host-native path can reinterpret it. ## What changed - Store special filesystem subpaths as strings in the core permissions model. - Represent app-server subpaths as `LegacyAppPathString` and convert them at the protocol boundary without changing their spelling. - Add `LegacyAppPathString::from_string` for callers that already own legacy app-server path text. GitOrigin-RevId: 2214f03aa997fd0e6eb2ab60d425304bb4bd6132
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Preserve special filesystem subpaths as wire strings
Why
Special filesystem subpaths can contain relative or foreign-platform path
spellings. Treating this wire text as a host-native path can reinterpret it.
What changed
LegacyAppPathStringand convert them atthe protocol boundary without changing their spelling.
LegacyAppPathString::from_stringfor callers that already own legacyapp-server path text.