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feat(bb_diag): auto-reset abnormal_reset_count on firmware change (#343)

- the counter was a lifetime total only cleared by DELETE /api/diag/boot
- record the app-sha fingerprint (first 4 bytes of esp_app_get_description()->app_elf_sha256) next to it in NVS (key app_fp, namespace bb_diag) and reset to 0 when the running build's sha changes (new flash/ota), so it reads "abnormal resets since this firmware was deployed"
- decision logic factored into a pure host-tested function bb_diag_reset_decision() in components/bb_diag/bb_diag_reset_decision.c
- the deploy boot is the clean baseline (not counted), subsequent same-build abnormal resets still increment
- both init sites (CONFIG_BB_DIAG_PANIC_CAPTURE enabled and disabled) updated consistently; NVS writes batched into a single open/commit/close transaction

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

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