fix: support runtime secret files INF-177

[chriszhao1988]

Scope

Add an opt-in JSON mapping from AWS Secrets Manager fields to protected runtime files.

Security behavior

• Mapped fields are excluded from .env.
• Runtime files are created with mode 600 and transferred into the service deployment directory.
• Runner-side .env and runtime files are removed even when deployment fails.
• No secret value is present in this branch or PR.

Consumer

Datacenter PR #46 uses JWT_PRIVATE_KEY and JWT_PUBLIC_KEY for its development and testnet deployment paths.

Validation

• YAML parse passed.
• A synthetic fixture confirmed mapped fields do not enter .env and both generated files use mode 600.

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