Auto-detect organizations for org usage and Prometheus

[sdairs]

Summary

• make --org-id optional for cloud org prometheus and cloud org usage
• resolve an omitted organization through the existing sole-organization auto-detection path
• update the README and add parsing plus real-binary request-path coverage

Why

These two organization commands required a positional organization ID even though the rest of the cloud surface uses an optional --org-id flag and auto-detects accounts with one organization.

Impact

Users with one organization can now run org prometheus or org usage without looking up and passing its ID. Users with access to multiple organizations can select one with --org-id. The existing required usage date flags are unchanged; date defaults remain a separate follow-up.

Stack

This PR is stacked on #345 and should be reviewed as the delta from codex/issue-340-local-use-error.

Closes #337.

Validation

• cargo fmt --all --check
• cargo build -p clickhousectl --all-targets
• cargo test -p clickhousectl
• cargo clippy -p clickhousectl --all-targets -- -D warnings

[Copilot]

Pull request overview

This PR aligns cloud org prometheus and cloud org usage with the rest of the cloud CLI surface by making organization selection optional via --org-id, falling back to the existing single-organization auto-detection path when omitted. It also updates documentation and adds both clap parsing and real-binary request-path coverage to prevent regressions.

Changes:

• Change cloud org prometheus and cloud org usage to accept optional --org-id and auto-detect when not provided.
• Route org resolution through the shared resolve_org_id(...) helper before calling the underlying CloudClient API methods.
• Update README examples and add integration tests that assert the binary hits /v1/organizations then the org-specific endpoint when org-id is omitted.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Updates org command examples to omit org id by default and documents --org-id for multi-org credentials.
crates/clickhousectl/tests/cli_request_shape_test.rs	Adds subprocess + wiremock coverage asserting org auto-detection request flow for prometheus/usage.
crates/clickhousectl/src/main.rs	Passes optional org id (as_deref()) through to the command handlers.
crates/clickhousectl/src/cloud/commands.rs	Resolves org_id via resolve_org_id for prometheus and usage before calling CloudClient methods.
crates/clickhousectl/src/cloud/cli.rs	Changes clap surface for org prometheus/org usage to optional --org-id and updates parsing + write-classification tests.

Suppressed comments (1)

crates/clickhousectl/src/cloud/cli.rs:432

• cloud org usage also drops the old positional <org-id> in favor of only --org-id, which is a breaking change for existing callers. If backward compatibility matters, consider accepting the positional org id as an alias and preferring an explicit --org-id when both are provided (with a clear error on ambiguity).

    /// Get organization usage/billing information
    Usage {
        /// Organization ID (auto-detected if not specified)
        #[arg(long)]
        org_id: Option<String>,

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