fix(cli): hide DATABASE_URL value from help

[hardbyte]

Summary

• preserve DATABASE_URL fallback while hiding its resolved value in generated help
• add a process-level regression test with credential-bearing sentinel data
• record the fix in the 0.6 changelog

Validation

• cargo test -p awa-cli --test help_cli_test
• cargo fmt --all -- --check
• SQLX_OFFLINE=true cargo clippy --all-targets --all-features -- -D warnings
• SQLX_OFFLINE=true cargo build --workspace

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