fw: robust HTTP body reads, CORS preflight, LED off at boot; update docs
- app_net.c: replace bare httpd_req_recv with recv_body_capped/alloc
helpers (TCP-safe, full-body reads); add OPTIONS/* CORS preflight
handler; bump WS broadcast buffer to 2048; add CORS Allow-Methods
- CMakeLists (net_service): add http_parser dep for HTTP_OPTIONS
- nfc_engine/pn532_core: add nfc_access_lock/unlock mutex, board-RGB
quiet helper, UL type detection, general-status improvements
- pn532_transport: minor cleanup
- main.c: call board_rgb_led_quiet() at boot to kill onboard LED
- sdkconfig.defaults: add board RGB Kconfig defaults
- README, docs/LIMITATIONS, docs/PINOUT: expand and correct
Made-with: Cursor
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