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fix(bb_http_client): expose BB_HTTP_CLIENT_TASK_STACK; raise update_check stack 4K → 8K (#249)

mbedTLS handshake during bb_http_client_get_stream needs 5-8 KiB stack for
scratch + cert-bundle parse. The previous 4 KiB stack on bb_update_check's
upd_check task overflowed into adjacent heap blocks on bitaxe-650 mining
workload, corrupting heap metadata and tripping the next calloc inside
esp_http_client_init. Caught by CONFIG_HEAP_POISONING_COMPREHENSIVE on the
TaipanMiner bench.

The 8 KiB floor is a property of bb_http_client (TLS path), not of any
individual consumer. Expose it as a Kconfig + macro so every future caller
of bb_http_client_get* uses the same budget. bb_ota_pull's OTA_CHECK_STACK
now derives from the same macro instead of duplicating the value.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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