fix(deploy): chmod real-seal script instead of install onto itself

[echobt]

Summary

• Staging master deploy failed after healthy gateway/backend smoke: install src==dest on prod-real-seal.sh.
• Use chmod 0755 so CI can go green and prod can be tagged.

Test plan

• Staging master deploy in CI

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 2c9aac4 and 07d0814.

📒 Files selected for processing (1)

• deploy/scripts/remote-deploy.sh

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