Add Intel media (VAAPI) driver detection to ll-driver-detect

[Metastarx]

Summary

The reference documentation lists org.deepin.driver.media.intel as an Intel video codec (VAAPI) driver that is not shipped in the base image and must be installed manually, but ll-driver-detect only registered the NVIDIA detector, so users with an Intel GPU never got the install prompt. This change adds an IntelMediaDriverDetector that follows the same pattern as the existing NVIDIA detector: it probes /sys/module/i915 and /sys/module/xe to decide whether an Intel GPU is present, queries the repository with ll-cli --json search and ll-cli --json list --type=extension, and returns a GraphicsDriverInfo that installs or upgrades org.deepin.driver.media.intel. The detector is registered in DriverDetectionManager next to the NVIDIA one, and both the driver guide and the tool README now state that the package is detected and offered automatically.

Verification

ctest --test-dir build-release --output-on-failure - passed (100% tests passed, 0 tests failed out of 750)

Checklist

• I ran the verification described above
• The change is minimal and includes no unrelated files
• The repository contribution guidelines were followed

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[deepin-ci-robot]

Hi @Metastarx. 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.

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