privacy: mask phone numbers by default and add --reveal override

[vincentayorinde]

Fixes #6

Summary

This change masks phone numbers by default in terminal output and saved filenames, and adds a --reveal flag for cases where an authorized investigator explicitly needs the full value.

Why

The tool currently exposes full phone numbers in terminal output and local image filenames. That increases the chance of leaking personal data through screenshots, shell history, or shared files.

What changed

• masks phone numbers in user-facing output by default
• masks phone numbers in saved image filenames by default
• adds a --reveal flag to show the full phone number only when explicitly requested
• keeps the core lookup flow unchanged

Scope

• no new dependencies
• no API changes
• no new OSINT capability
• minimal change centered on safer defaults

Behavior

• default: masked number in output and filenames
• with --reveal: full number in output and filenames

Testing

• ran the script normally and confirmed phone numbers are masked in terminal output
• confirmed saved filenames use the masked number by default
• ran the script with --reveal and confirmed full numbers appear in output and filenames
• confirmed lookup behavior is otherwise unchanged