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refactor: prune REQUIRES surface and route event heap to SPIRAM (#298)

A. REQUIRES → PRIV_REQUIRES sweep (10 components):
- bb_log: esp_ringbuf, freertos, log, bb_nv → PRIV_REQUIRES
- bb_wifi: esp_wifi, esp_netif, esp_event, esp_timer, esp_system, lwip, bb_log, bb_nv → PRIV_REQUIRES
- bb_ota_pull: esp_https_ota, esp_http_client, app_update, esp_app_format, esp-tls, mbedtls → PRIV_REQUIRES
- bb_mdns: app_update removed; esp_app_format → PRIV_REQUIRES
- bb_ntp: esp_netif, lwip → PRIV_REQUIRES
- bb_event: bb_log, bb_registry → PRIV_REQUIRES
- bb_button_events: bb_log → PRIV_REQUIRES
- bb_led_anim: bb_log → PRIV_REQUIRES
- bb_prov: esp_wifi, esp_netif, lwip → PRIV_REQUIRES
- bb_nv: nvs_flash → PRIV_REQUIRES

B. Drop spurious includes from bb_log.h:
- removed bb_nv.h and freertos/FreeRTOS.h from #ifdef ESP_PLATFORM block
- moved required freertos includes (ringbuf, queue, task) to bb_log.c

C. SPIRAM-preferred allocator for bb_event_ring and bb_event_routes:
- expose bb_event_ring_set_allocator / bb_event_routes_set_allocator
  unconditionally (previously test-only guards); used by both tests and
  the new ESP-IDF platform SPIRAM init
- platform/espidf/bb_event_ring_espidf/bb_event_ring_spiram.c: EARLY-tier
  init that overrides ring allocator to MALLOC_CAP_SPIRAM|8BIT with
  MALLOC_CAP_DEFAULT fallback (~4 KB per topic stays in PSRAM)
- platform/espidf/bb_event_routes_espidf/bb_event_routes_spiram.c: called
  at route-init time, overrides client-queue allocator similarly (~2 KB per
  client stays in PSRAM)

TM verification: TaipanMiner components that REQUIRES any of the 10 bb_*
components: board (bb_log), knot (bb_log, bb_mdns, bb_nv), asic (bb_nv,
bb_log), config (bb_nv, bb_log, bb_mdns), mining (bb_nv, bb_log, bb_event),
stratum (bb_nv, bb_ota_pull, bb_wifi), webui (bb_wifi, bb_prov, bb_mdns,
bb_nv, bb_ota_pull, bb_log), ota_validator (bb_log). Grep confirms: no TM
source file includes esp_wifi.h, esp_netif.h, lwip headers, or nvs_flash.h
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