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Add help text to the esp32h2/esp32h21/esp32h4 Kconfig.mac explaining that these chips only consume one universally administered MAC address: the IEEE 802.154 EUI-64 is derived from the base MAC and MAC_EXT, and Bluetooth reuses the base MAC as-is (no BT offset, since there is no Wi-Fi). Add a matching 1-MAC derivation table and note to misc_system_api.rst (EN and zh_CN) under a new `.. only:: esp32h2 or esp32h21 or esp32h4` block, and exclude these targets from the generic 4/2 table. Add an esp32s31-only note stating that the "Four" option may only be used with a customer-provided custom base MAC range, since ESP32-S31 only provides two universally administered MAC addresses in eFuse. Co-authored-by: Cursor <cursoragent@cursor.com>