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refactor: move RSSI + net-mode classifiers from bb_net_health to bb_wifi (#889)

- move the pure RSSI-bucket + hysteresis state machine to bb_wifi as
  bb_wifi_classify_link()/bb_wifi_link_state_t/bb_wifi_link_hyst_t
- move the net-mode classifier to bb_wifi as bb_wifi_classify_mode()/
  bb_wifi_mode_t (renamed verbatim from bb_net_health_classify_mode/
  bb_net_mode_t)
- bb_net_health_eval keeps the MQTT-fused early_warning computation,
  now calling bb_wifi_classify_link() internally instead of hand-rolling
  the RSSI bucket/hysteresis logic
- rename Kconfig options into bb_wifi (BB_NET_HEALTH_RSSI_GOOD ->
  BB_WIFI_RSSI_GOOD, BB_NET_HEALTH_RSSI_MARGINAL_LO ->
  BB_WIFI_RSSI_MARGINAL_LO, BB_NET_HEALTH_HYST_DOWN -> BB_WIFI_HYST_DOWN,
  BB_NET_HEALTH_HYST_UP -> BB_WIFI_HYST_UP), same C defaults; a saved
  sdkconfig override of the old names silently reverts to default
  (device-config surface change, not NVS -- no data loss)
- bb_net_health.h now includes bb_wifi.h and REQUIRES bb_wifi publicly
  (was PRIV_REQUIRES) since the public header depends on the moved types
- relocate the RSSI/hysteresis and net-mode classifier host tests into
  test_bb_wifi.c, calling bb_wifi_classify_link()/bb_wifi_classify_mode()
  directly; the fusion (early_warning), egress, heap, emit, and log
  helper tests stay in test_bb_net_health.c

Egress classifier and wifi_reconn.c's CONFIG_BB_NET_HEALTH_EGRESS_ACT_ENABLE
gate are untouched -- deferred to a later lane.

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