feat(cli): use --node for dora logs node selection

[GHX5T-SOL]

Fixes #1880

Summary

• make dora logs node selection explicit with --node/-n
• reject the old dora logs DATAFLOW NODE shape in parser tests
• update CLI/logging docs and user-facing hints to show the new form

Validation

• cargo test -p dora-cli command::tests:: passed: 74 passed, 0 failed, 78 filtered out
• cargo fmt --all -- --check passed
• git diff origin/main..HEAD --check passed
• gitleaks detect --source . --log-opts=origin/main..HEAD --redact --no-banner passed: no leaks found
• cargo clippy -p dora-cli --all-targets -- -A clippy::unnecessary-sort-by -D warnings passed

Note: strict clippy without the allow currently hits the existing Rust 1.95 clippy::unnecessary_sort_by warning in binaries/coordinator/src/lib.rs:3698, outside this change.

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[phil-opp]

This is a breaking change, right? Can we perhaps add a hidden positional argument that gives a better error message? E.g. something like 'use the --node argument' instead of just failing with a generic "unexpected argument" error?

There are also some docs that still use the old syntax after this PR, e.g. quickstart.md or the guide. These need to be fixed before merging.

[GHX5T-SOL]

Addressed this in 17bb016a:

• added a hidden legacy positional node argument so dora logs <dataflow> <node> reaches a targeted runtime hint instead of a clap parse error
• kept the --node path as the documented node filter
• updated the stale quickstart and README.zh-CN references

Validation:

• cargo fmt -p dora-cli -- --check
• cargo test -p dora-cli command::tests::parse_logs -- --nocapture (6 passed, 0 failed)
• cargo run -p dora-cli --bin dora -- logs my-dataflow sensor -> reports: "hint: use dora logs my-dataflow --node sensor instead"
• git diff --check
• git diff -- binaries/cli/src/command/logs.rs binaries/cli/src/command/mod.rs README.zh-CN.md docs/quickstart.md | gitleaks detect --pipe --redact --no-banner -> no leaks found