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Replace server-side /frontends endpoint with client-side plugin system. The Plugins tab now has Overview and APRS sub-tabs. The APRS plugin decodes packets from RX audio using Bell 202 AFSK demodulation (1200 baud), AX.25 frame decoding with NRZI/HDLC, and CRC-16-CCITT validation. Decoded packets are displayed in a scrolling log. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>