Validate local client selectors and ports

[sdairs]

Summary

• reject --name with --host or --port at Clap parsing time, regardless of argument order
• reject client port zero while retaining ports 1 and 65535
• preserve and document ClickHouse direct-mode defaults: host-only uses port 9000 and port-only uses localhost
• apply the same selector and client-port validation to the analogous local Postgres client
• cover selector matrices and real subprocess behavior with isolated fake binaries

Closes #466

Verification

• cargo test -p clickhousectl local::cli::tests::client_ (3 passed)
• cargo test -p clickhousectl --test local_client_selectors_test (2 passed)
• cargo test -p clickhousectl (750 passed across unit and integration tests)
• cargo fmt --all --check
• cargo clippy -p clickhousectl --all-targets -- -D warnings

Stack

• Position: child 3 of 3
• Base: Add --name compatibility to local server stop and remove #488 (issue-474-stop-remove-name-flag)
• Parent PR is unchanged and should merge first.