[codex] Build pure Python reconnaissance workflow

[asaotomo]

Summary

• replace the nmap-backed port scan with a pure Python TCP connect scanner and banner/TLS probing
• add DNS record enumeration, HTTP/TLS fingerprinting, soft-404 directory filtering, wildcard-aware subdomain discovery, and JSON/CSV exports
• remove runtime dependencies on nmap, ipinfo.io, ip138 reverse lookup pages, and tldextract
• refresh README usage commands for V1.1.0 and remove outdated terminal screenshots

Validation

• python3 -m py_compile searchmap.py
• python3 searchmap.py -h
• python3 searchmap.py -u 127.0.0.1 --timeout 0.5 --json-out /private/tmp/searchmap-test.json
• python3 searchmap.py -u 127.0.0.1 --timeout 0.2 -p --ports 1
• python3 searchmap.py -u 127.0.0.1 --timeout 0.2 --csv-out /private/tmp/searchmap-test.csv
• git diff --check

Local network probes against 127.0.0.1 reported sandbox-level connection denial for 80/443, but the failure paths, CLI parsing, port scan path, and structured exports completed successfully.