fix(ll-driver-detect): detect config write failures in saveConfig

[chennaji9]

What does this PR do?

DriverDetectionConfigManager::saveConfig() only detected that the output file failed to OPEN:

std::ofstream file(configFilePath);
if (!file.is_open()) {
    return false;
}
file << jsonConfig.dump(4);
file.close();
return true;

If the write or close fails afterwards (ENOSPC, quota, read-only mount), the stream enters a failed state but the function still returns true — the user's "never remind me again" choice silently fails to persist.

Check the stream state after closing and return false on failure (with a warning log), so callers can react.

Validation

• New unit test DriverDetectionConfigTest.SaveConfigFailsOnWriteError constructs the manager with /dev/full (opens fine, writes fail with ENOSPC) and asserts saveConfig() returns false. On systems without /dev/full the open itself fails, so the assertion holds either way.
• All existing driver-detection config tests still pass: ctest -R DriverDetectionConfig → 7/7 Passed (DefaultConstruction, ConfigManagerConstruction, LoadNonExistentConfig, SaveAndLoadConfig, round-trip included, plus the new one).
• Full ll-tests target builds cleanly with the change.

🤖 Generated with Claude Code

[deepin-ci-robot]

Hi @chennaji9. Thanks for your PR.

I'm waiting for a OpenAtom-Linyaps member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...s/ll-driver-detect/src/driver_detection_config.cpp	66.66%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
...s/ll-driver-detect/src/driver_detection_config.cpp	37.14% <66.66%> (+9.01%)	⬆️

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