dangernoodle-io / TaipanMiner / 26175626047

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feat(stats): per-pool lifetime stats + block-found detection (#413)

Replaces the aggregate mining_lifetime_t schema (which had a dead
total_hashes field that never incremented in any code path) with
mining_pool_stats_t: an 8-slot LRU table indexed by host:port. Each
slot tracks shares, hashes (now actually wired at the Tier-2 mining
yield), best_diff, blocks_found, and last_seen_us. NVS persistence
uses per-field keys (ps<N>_<field>); legacy lt_* keys are erased on
first boot. No migration — users start fresh.

share_validate.c gains share_meets_network_target(hash, nbits) which
unpacks the standard Bitcoin nbits → 256-bit target and compares the
share hash. Mining/asic loops call it after the pool-target pass; on
match, the slot's blocks_found bumps and a "block.found" bb_event
fires with {host, port, share_diff} payload.

Stratum resolves and caches the active pool slot on each connect
(find_or_alloc by host:port, case-insensitive host match, LRU
eviction when full).

/api/stats no longer emits `lifetime`. /api/pool grows a `stats`
array (up to 8 entries, ordered by last_seen_us descending) so the
webui Pool page can render history. Heap-allocate pool_snapshot_t
in the handler — it's now ~3 KB and was crashing the 6 KB httpd
worker stack with stack-overflow panics.

Webui:
- blockFoundState (mirrors updateAvailableState): SSE subscriber for
  block.found, sticky banner state with localStorage dismissal
  (key taipanminer.blockFound.dismissedAt). Banner only re-shows when
  a newer event arrives.
- BlockFoundBanner: green pill at top of <main>, dismissable.
- PoolStatsCard: per-pool stats display, highlights the active pool.
- Pool.svelte gains a "pool history" section rendering all slots.

Tests:
- Host: 550 pass (+11) — pool_stats find_or_alloc + LRU + record_*,
  share_meets_network_target with genesis-block + edge vectors.
- Webui: 1072 pass (+25) — blockFoundState SSE/localStorage, banner
  render/dismiss, PoolStatsCard formatting + active high... (continued)

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