Preserve native query and query-file multiplicity in local client

[sdairs]

Summary

• preserve every repeated --query value and forward each as a native query option in source order
• accept multiple --queries-file paths, including repeated wrapper flags, and emit the native multi-path argv shape
• reject mixed inline-query and query-file sources as a clear clap usage error, matching native behavior instead of silently reordering
• keep pass-through arguments after all wrapper-generated arguments and document the behavior in help and README

Closes #470

Decision

Native source for 25.8.32.4 LTS, 25.12.9.61, 26.3.21.7 LTS, 26.7.5.10 stable, and current master uses a repeatable query vector, a multi-token queries-file vector, and rejects the two source types together. The wrapper therefore emits repeated --query pairs, emits one --queries-file followed by every path, and rejects combined forms before resolution or child execution. The JSON output contract in #468 remains unchanged.

Verification

• cargo fmt --all --check
• cargo build -p clickhousectl
• cargo test -p clickhousectl (762 passed)
• cargo clippy -p clickhousectl --all-targets -- -D warnings
• parser/help and fake-child matrices cover omitted, single, repeated, empty, ordered, mixed, and -- pass-through forms across the existing 25.x and 26.x client-version fixtures

Stack

• Position: child 5 of 5 in gh-stack #489
• Base: Allow direct local client connections to select a binary version #500 (issue-469-direct-client-version)
• Parent PR is unchanged and should merge first.

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[iskakaushik]

LGTM

[sdairs]

Superseded by #553 in stack #563.