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jae/wifi timer resilience (#581)

* feat(bb_wifi): no-IP-while-associated watchdog + no_ip_recoveries wifi telemetry (B1-381)

- add BB_WIFI_NO_IP_WATCHDOG_ENABLE (bool, default n) + BB_WIFI_NO_IP_WATCHDOG_S
  (int, default 60, range 10-600, depends on ENABLE) to components/bb_wifi/Kconfig;
  orthogonal to BB_WIFI_INACTIVE_TIME_ENABLE; no EGRESS_PROBE knobs restored
- bridge macros BB_WIFI_NO_IP_WATCHDOG_ENABLE + WIFI_RECONN_NO_IP_WATCHDOG_MS
  in platform/espidf/bb_wifi/wifi_reconn.h (mirrors INACTIVE_TIME pattern)
- wifi_reconn_policy.h: add no_ip_count + last_no_ip_us to wifi_reconn_state_t;
  add WIFI_REASON_BB_NO_IP_WATCHDOG sentinel (101); declare
  wifi_reconn_policy_on_no_ip() — distinct from on_lost_ip (event-driven)
- wifi_reconn_policy.c: implement wifi_reconn_policy_on_no_ip() bumping
  no_ip_count, last_no_ip_us, reason_histogram[101], and arming first_fail_us
  (B1-353: restart resets FSM timing so no-IP restart cannot compound with
  5-min safeguard window unintentionally); add no_ip_count/last_no_ip_us
  to wifi_reconn_state_reset()
- wifi_reconn.c: ST_IDLE queue wait uses WIFI_RECONN_NO_IP_WATCHDOG_MS when
  BB_WIFI_NO_IP_WATCHDOG_ENABLE; adds else-if(state==ST_IDLE) timeout branch
  calling esp_wifi_sta_get_ap_info + bb_wifi_has_ip, on associated&&!has_ip:
  calls wifi_reconn_policy_on_no_ip, bb_alert_emit(wifi_no_ip) (guarded
  BB_ALERT_ENABLE), bb_wifi_restart_sta(); egress-ICMP probe NOT restored;
  add wifi_reconn_get_no_ip_count() getter
- bb_wifi.h: add bb_wifi_get_no_ip_count() declaration
- platform/espidf/bb_wifi/bb_wifi.c: implement bb_wifi_get_no_ip_count()
  (mirrors bb_wifi_get_egress_dead_count pattern)
- platform/host/bb_wifi/bb_wifi_host.c: add bb_wifi_get_no_ip_count() stub
  returning 0 (mirrors line ~154 egress_dead stub)
- platform/host/bb_wifi/bb_wifi_emit.c: add no_ip_recoveries field sourced
  from bb_wifi_get_no_ip_count() (DIAGNOSTICS, not health; drives both
  /api/wifi and MQTT wifi subtopic via single emit... (continued)

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