Introduce a cross-platform libpcap/Npcap capture backend with a Windows raw-socket fallback and plumbing to select backends via --capture-backend. Add ctypes-based libpcap wrapper (open_libpcap_capture, CaptureStats, LibpcapUnavailable) and a backend factory; refactor live capture runner to use the new backend, StopKeyMonitor, and improved clipboard handling. Make session and protocol decoders resilient to pipelined/multi-page responses and non-byte-aligned streams (alignment iterator, alignment-aware decoding, embedded-record trimming, slice support). Update mitmproxy flows adapter to reuse LiveHistorySession. Expand console messages and docs/README to explain cross-platform requirements, usage, and capture diagnostics. Minor: update package description in pyproject and adjust ARC/response handling and row bookkeeping to record row indices.
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