cli: add alias-aware query path normalizer

[salmonumbrella]

Summary

• add a centralized lowercase alias map with deterministic canonical targets
• add a single alias normalizer used only in query/path contexts
• add alias-aware JSON query flags: --query-path, --field, --jsonpath, --sort-path, --sort-desc, --jq
• preserve canonical payload JSON keys (no payload mutation)
• add focused unit + integration tests for rewrite and no-rewrite edge cases
• update CLI help + README + skill docs with full alias table and before/after examples

Validation

• cd cli && cargo test