Fix opendir/readdir returning no entries when drivers have major/minor device numbers

[Copilot]

compare_driver_directory used exact-match between the listed path and a driver's parent directory. Drivers with major+minor numbers (e.g. path dmgpio8/1, parent dmgpio8/) never matched when listing /, so get_next_driver_node always returned NULL.

Changes

• compare_driver_directory: extended from exact-match to prefix-match. Root "/" now matches all drivers; any other path matches drivers whose parent starts with path + "/".

• read_next_subdir_name (new helper): given the listing base path and a driver's parent path, extracts the correct immediate child name:

  base="/"       full="dmgpio8/"   → "dmgpio8"
  base="/"       full="a/b/c/"     → "a"
  base="a/"      full="a/b/c/"     → "b"
  

• readdir else branch: replaced read_dir_name_from_path(parent_dir, ...) with read_next_subdir_name(dir_node->directory_path, parent_dir, ...) so subdirectory entries always resolve to the correct depth-relative name instead of the leaf of the full parent path.

Original prompt

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This section details on the original issue you should resolve

<issue_title>opendir i readdir nie zwracają plików</issue_title>
<issue_description>dmdevfs nie listuje katalogów w środku głównej ścieżki. Np:

[INFO] Preinit function not set
DMGPIO module initialized (STM32F7)
[INFO] Module enabled: dmgpio
dmdevfs: [INFO] Prepared driver module: dmgpio (was_loaded: 0, was_enabled: 0)
[███░░░] dmdevfs: Resolving driver interface: dmgpio
[████░░] dmdevfs: Creating driver context: dmgpio
dmgpio: [INFO] GPIO PI[0x2] configured: mode=output, pull=none, speed=minimum, circuit=push_pull
dmgpio: [INFO] GPIO device created for PI[0x2]
[█████░] dmdevfs: Reading driver node path: dmgpio
[  OK  ] dmdevfs: Configured driver: dmgpio (path: dmgpio8/1)

A potem:

stm32f746xg@/> ls /dev/

stm32f746xg@/> 

Z tego co widziałem, to coś jest nie tak w compare_driver_directory - path mamy /, a parent_dir jest dmgpio i przez to jakos get_next_driver_node zwraca NULL</issue_description>

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

• Fixes opendir i readdir nie zwracają plików #32

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