docs(release): standardize release notes and artifact lists

[thxCode]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

• Put ⚠️ Limitations before Other in release notes and place image and chart inventories in Appendix.
• List resulting image references and chart versions directly, including conditional workloads and bundled charts; verify published artifacts before attaching notes.
• Compare Refactor entries with the previous stable release so internal changes to newly introduced modules do not appear as changes to already released behavior.

Which issue(s) this PR links to:

None

Special notes for your reviewer:

• make lint docs, RACE=false make test (the CI unit-test mode), and git diff --check passed.
• make test with the race detector found a pre-existing data race in Test_k8sCache_TamperedSecretIsLoggedAsKeyValuePairs: the test sets the global klog logger while a background reflector reads it. The same race reproduced on unchanged main with the failing shuffle seed.
• The skill content passed quick_validate.py in a temporary copy without the repository's pre-existing disable-model-invocation frontmatter key, which that generic validator does not recognize.

Does this PR introduce a user-facing change?

NONE

[gpustack-code-review]

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