fix(firmware): change promiscuous filter to ALL frames for CSI capture

ESP32-S3 CSI requires DATA frames (LTF extraction) — MGMT-only filter
silences CSI entirely on this chip revision because management frames
(beacons, probe req/resp) contain no extractable LTF.

Root cause: CSI yield=0pps despite WiFi connected and RSSI healthy.
Fix: WIFI_PROMIS_FILTER_MASK_MGMT → WIFI_PROMIS_FILTER_MASK_ALL.

Verified on Heltec LoRa V3 (ESP32-S3FN8 rev v0.2, Zyxel_D631 AP).
Post-fix yield: 5-8 pps stable.

Note: On busy networks (100+ data frames/sec) this may cause WiFi HW
interrupt storms that crash Core 0. Low-traffic networks are safe.

firmware/esp32-csi-node/main/csi_collector.c

@@ -472,7 +472,7 @@ void csi_collector_init(void)
      * adds ~10 Hz probe responses from APs → ~20 Hz total, matching the
      * edge processing designed sample rate of 20 Hz. */
     wifi_promiscuous_filter_t filt = {
-        .filter_mask = WIFI_PROMIS_FILTER_MASK_MGMT,
+        .filter_mask = WIFI_PROMIS_FILTER_MASK_ALL,
     };
     ESP_ERROR_CHECK(esp_wifi_set_promiscuous_filter(&filt));