feat: default to found-only results and introduce --all flag, progress bar with rich

[kaifcodec]

• Rename only_found configuration parameter to show_all and default to False
• Intercept --only-found flag to warn users of deprecation and exit gracefully
• Add --all flag to allow users to view all results including targets that were not found or errored
• Update docs/FLAGS.md and README.md to reflect new flag behavior
• Update tests in test_orchestrator.py to account for new show_all=False default

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• Add dynamic terminal progress bar using rich displaying live percentage and processed module counts
• Ensure progress bar cleans up seamlessly upon scan completion without leaving terminal artifacts
• Support progress bar across standard, category-specific, and module-specific username and email scans"

[kristoisberg]

Tested it out and looks much cleaner than before. No issues found, LGTM.

[VamatoHD]

LGTM