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feat: back up wifi creds to RTC, restore + heal on NVS erase-on-corruption (#350)

* feat: add pure bb_nv creds-mirror pack/validate/crc + host tests

- add bb_nv_creds_mirror_t struct (magic, version, provisioned, pad,
  ssid[32], pass[64], crc) with portable software crc-32 (0xedb88320)
- expose pack/valid/crc api; single crc code path used by both
- wire bb_nv_creds_mirror.c into component cmake and native_scaffold
- 12 host tests covering round-trip, bit-flip detection, magic/version
  mismatch, null guard, truncation, null inputs, empty-ssid contract

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: back up wifi creds to RTC, restore + heal on NVS erase

- add CONFIG_BB_NV_CREDS_RTC_BACKUP kconfig (default y); mirrors ssid/pass/provisioned into RTC_NOINIT_ATTR bb_nv_creds_mirror_t so a crash-induced NVS erase doesn't strand a headless board
- set s_nvs_was_erased on the erase-and-retry path (bb_nv_flash_init); change log level to bb_log_e — always present under ESP_PLATFORM independent of gate
- repack mirror in set_wifi and set_provisioned after successful commit; invalidate (memset zero) in clear_wifi and clear_provisioned so deliberate factory-reset is never resurrected
- restore + heal in bb_nv_config_init: close read-only handle, reopen read-write, write-back ssid/pass/provisioned in one commit, log distinctive message; in-memory fallback if reopen fails
- add bb_nv_config_was_erased() and bb_nv_config_creds_restored() — both unconditionally defined under ESP_PLATFORM; creds_restored() returns false when gate is off
- document in CLAUDE.md bb_nv_config section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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