feat: add CLI configuration flags
Add clap-powered --bind, --static-dir, and --data-dir flags for human-run server configuration. The merge order is now explicit: command-line arguments win over UPL_* environment variables, which still fall back to the existing repository-local defaults. Document the new flags and allow just run to forward arguments to cargo so the help text can be checked through the normal task runner. Test Plan: - just check - cargo run -- --help Refs: none
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