feat(whiteboard): add parse image shortcuts

[ZKHelloworld]

Summary

• Add whiteboard +parse-image for user-mode multipart ParseImage submit.
• Add whiteboard +parse-image-result for one-shot or --wait task result polling.
• Document the ParseImage workflow in lark-whiteboard skill docs and add dry-run E2E coverage.

Test Plan

• make build
• go test ./shortcuts/whiteboard -run 'ParseImage' -v\n- go test ./shortcuts/whiteboard -v\n- go test ./tests/cli_e2e/whiteboard -run 'ParseImageDryRun' -v\n- go test ./cmd ./shortcuts/whiteboard -run 'ParseImage|Shortcuts|Unknown'\n- git diff --check\n

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