Add --phrase flag for exact string matching in search command

[dreamer-coding]

Summary

Introduce a --phrase flag to enforce exact string matching.

Motivation

Users need a reliable way to match exact phrases without partial or fuzzy results.

Proposed Solution

Add a --phrase flag that ensures literal, exact matching of input queries.

Alternatives Considered

Relying on implicit behavior, which may vary and cause confusion.

Additional Context

Complements regex support by providing a clear alternative for precise matching