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feat(bb_nv): factory-reset endpoint — full NVS wipe + RTC-mirror invalidate (#386)

POST /api/factory-reset (Kconfig CONFIG_BB_NV_FACTORY_RESET, default off)
requires a confirm body {"confirm":"factory-reset"} -> 202 + deferred
500ms reboot; device boots clean into provisioning.

the load-bearing bit: bb_nv_config_factory_reset() does a FULL
nvs_flash_erase AND zeros the RTC creds-mirror magic. without the mirror
invalidation, bb_nv's restore-heal (CONFIG_BB_NV_CREDS_RTC_BACKUP) would
re-populate the wiped creds on the next boot and the reset would silently
fail. also clears s_config/s_pending.

400 on missing/wrong confirm. host-tested (11 tests); coverage 100%;
smoke green on esp32, esp32c3, esp32-p4, tdongle-s3.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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