SD card (SPI + CD), GPS PPS polarity/diagnostics, wiring docs
- Add sd_card component: SPI mode for ESP32-C5, optional CD (GPIO -1 to disable)
- Add sdcard console command; CD shift fix for CONFIG_SD_CD_GPIO=-1
- GPS: pps_active_low support, gps pps-test / pps-scan console commands
- board_config: ESP32-C5 SD pins (7,8,9,10,26), GPS PPS polarity
- doc/SD_CARD_WIRING.md, doc/GPS_WIRING.md: pin diagrams, Y-cable power note
- sdkconfig.defaults.esp32c5: SD CD GPIO 26
- php/mcs_fiwi.php: Fi-Wi demo page
Co-authored-by: Cursor <cursoragent@cursor.com>
a4e81c9852