Add Dmod_ReadDirEx for directory entries with type information

[Copilot]

The existing Dmod_ReadDir only returns entry names. Need type information (file vs directory) similar to POSIX dirent.

Changes

• New types (dmod_types.h):

  • Dmod_DirEntryType_t: enum for Unknown, File, Dir, Link, Other
  • Dmod_DirEntry_t: struct with name and type fields

• New API (dmod_sal.h, dmod_if_file.c):

  • Dmod_ReadDirEx() returns const Dmod_DirEntry_t* with type detection via d_type
  • Static storage semantics match POSIX readdir() (not thread-safe across calls)
  • Degrades gracefully to Unknown type on platforms without d_type support

• Tests (tests_dmod_dir.cpp):

  • Type detection, end-of-directory handling, backward compatibility validation
  • All existing Dmod_ReadDir tests remain passing

Example

void* dir = Dmod_OpenDir(".");
const Dmod_DirEntry_t* entry;
while ((entry = Dmod_ReadDirEx(dir)) != NULL) {
    if (entry->type == Dmod_DirEntryType_Dir) {
        // Handle directory
    }
}
Dmod_CloseDir(dir);

// Original API still works unchanged
const char* name;
while ((name = Dmod_ReadDir(dir)) != NULL) { ... }

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Dodać Dmod_ReadDirEx, który zwraca więcej informacji</issue_title>
<issue_description>Aktualnie Dmod_ReadDir zwraca tylko nazwę pliku/katalogu, a przydaje się trochę więcej info - np czy to katalog czy plik. Potrzebujemy zatem dodatkowego interfejsu, może czegoś podobnego do dirent? Musimy być kompatybilni wstecz, więc niech Dmod_ReadDir zostanie jak był, ale dodajmy ten nowy interfejs obok</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dodać Dmod_ReadDirEx, który zwraca więcej informacji #197

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