Fixes #1

Summary

• Adds DNS history fields to JSON output: first_seen, last_seen, and seen.
• Preserves records from previous JSON input when they are not observed in the current scan, so rotating/load-balanced DNS records remain in the dataset.
• Adds --fs, --ls <days>, and --lsd <MM/DD/YYYY|MM-DD-YYYY> flags for first-seen and stale last-seen logging.
• Reads both the new snake_case fields and legacy dashed keys (first-seen, last-seen) from existing JSON.
• Updates CMake/OpenSSL linking and small Boost compatibility issues so the project builds with the current Homebrew toolchain.

Validation

• git diff --check
• clang++ -std=c++17 -I dooked/include -I dooked/json/include -I dooked/spdlog/include -I dooked/CLI11/include -I /opt/homebrew/include -I /opt/homebrew/opt/openssl@3/include -fsyntax-only dooked/source/main.cpp dooked/source/cli_preprocessor.cpp dooked/source/utils/io_utils.cpp
• cmake -S dooked -B build -DOPENSSL_ROOT_DIR=/opt/homebrew/opt/openssl@3 && cmake --build build -j2
• Manual smoke test: run against example.com, verify JSON contains first_seen, last_seen, seen, then re-run from the JSON input and verify seen increments.

Bounty payout

If this is selected for the listed bounty, my PayPal link is: https://paypal.me/xiaoshuai12138