fix(cli): use valid envt variable names for env fallbacks

fix(cli): use valid envt variable names for env fallbacks

Several `#[arg(env = "...")]` attributes mistakenly used colons (e.g.,
`ADDRESS:SAT`) following value-shape documentation conventions. Because
colons are invalid in POSIX environment variable names, these fallbacks
could never actually be set by users.

Renamed these environment variables to use valid identifiers while
keeping the flag names and expected value shapes unchanged.

Also, format integration tests