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fix(bb_wifi): non-blocking get_info/get_rssi via cached snapshot (#81)

bb_wifi_get_info called esp_wifi_sta_get_ap_info on every invocation,
which takes the WiFi driver mutex. under heavy WiFi load (reconnect,
scan, heavy tls) the call blocks for seconds, causing /api/info to
hang on downstream consumers (taipanminer TA-56).

cache ssid + bssid from the WIFI_EVENT_STA_CONNECTED event payload
(no driver call needed), and refresh rssi via a 5s periodic esp_timer
that calls esp_wifi_sta_get_ap_info off the HTTP handler path.

bb_wifi_get_info and bb_wifi_get_rssi now do plain memory reads — no
mutex, no driver call. last-known rssi is at most 5s stale which is
fine for observability.

esp_netif_get_ip_info (in bb_wifi_get_ip_str) not yet cached — it's
a struct read and typically fast, but could be revisited if it shows
up in profiling.

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

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