feat: add local-db manifest URL command

[findolor]

Chained PRs

• Rename OrderBook to Raindex #2526

Motivation

rain.local-db.remote currently fetches a settings YAML file and parses local-db-remotes in shell to discover manifest URLs. That duplicates settings parsing logic outside Rust and can drift from the CLI/parser behavior.

Solution

Add a local-db manifest-urls CLI command that prints local DB remote manifest URLs from settings YAML:

raindex_cli local-db manifest-urls --settings-yaml "$settings_yaml"

• Parse settings through RaindexYaml, so normal settings requirements such as version and local-db-remotes validation apply.
• Print only manifest URLs to stdout, one URL per line, sorted by remote key for deterministic script output.
• Keep diagnostics/errors on stderr through the existing CLI error path.
• Reject duplicate local-db-remotes URL values in the core settings parser, so all settings consumers share the same uniqueness rule.
• Add focused parser and CLI tests for single URL output, duplicate URL rejection, no-remotes output, missing version failure, and exact stdout formatting.

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

Verified locally:

• nix develop -c cargo fmt --all
• nix develop -c cargo test -p raindex_app_settings local_db_remotes
• nix develop -c cargo test -p raindex_cli manifest_urls
• nix develop -c cargo test -p raindex_cli verify_cli
• nix develop -c rainix-rs-static

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• Create PR with unit tests
• Commit unit tests in branch local-db-manifest-urls

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