targets-extensions: enable seeed-extension for reComputer boards

[Mkiring]

Description

Adds ENABLE_EXTENSIONS="seeed-extension" to release-targets/targets-extensions.map for:

• recomputer-rk3576-devkit
• recomputer-rk3588-devkit

Scoped to the vendor branch only — the Seeed extension (OTA support, disk encryption, security hardening, U-Boot postprocess) depends on the vendor U-Boot chain and is not meant for the mainline edge branch.

Dependencies

Requires armbian/build#10698 to land first — that PR adds the seeed-extension wrapper to armbian/build. Merging this before the wrapper exists would fail the vendor-branch CI builds of these two boards with an unknown-extension error. Happy to hold this until that lands.

How Has This Been Tested?

• Wrapper chain verified on the build side via configdump with ENABLE_EXTENSIONS=seeed-extension on both boards' family config (see extensions: add seeed-extension wrapper pinning Seeed's external repo build#10698): pinned tag:v1.1 fetch + sub-extension cascade resolve cleanly
• Map syntax follows the BOARD:branch::ENABLE_EXTENSIONS="ext" format consumed by scripts/generate_targets.py:load_extensions_map (vendor-only branch filter parses as {'vendor'})

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!

[Lesords]

Since this PR（https://github.com/armbian/build/pull/10693） has been merged,

board information needs to be added.