feat: Add NVS and partition info to STATUS response

- nvs_used: NVS entries in use
- nvs_free: free NVS entries
- nvs_total: total NVS entries
- part_size: running partition size in bytes

get-started/csi_recv_router/main/app_main.c

@@ -35,6 +35,7 @@
 #include "esp_heap_caps.h"
 #include "esp_ota_ops.h"
 #include "esp_https_ota.h"
+#include "esp_partition.h"
 #include "esp_http_client.h"
 #include "driver/gpio.h"
 #include "soc/soc_caps.h"
@@ -1524,12 +1525,29 @@ static int cmd_handle(const char *cmd, char *reply, size_t reply_size)
         const char *csi_mode_str = (s_csi_mode == CSI_MODE_COMPACT) ? "compact" :
                                    (s_csi_mode == CSI_MODE_HYBRID)  ? "hybrid" : "raw";
 
+        /* NVS stats */
+        nvs_stats_t nvs_stats = {0};
+        nvs_get_stats("nvs", &nvs_stats);
+
+        /* Partition info */
+        const esp_partition_t *running = esp_ota_get_running_partition();
+        uint32_t part_size = running ? running->size : 0;
+        uint32_t app_size = 0;
+        if (running) {
+            esp_app_desc_t desc;
+            if (esp_ota_get_partition_description(running, &desc) == ESP_OK) {
+                /* App size not directly available, use partition size */
+                app_size = part_size;
+            }
+        }
+
         snprintf(reply, reply_size,
                  "OK STATUS uptime=%s uptime_s=%lld heap=%lu rssi=%d channel=%d tx_power=%d rate=%d csi_rate=%d"
                  " hostname=%s version=%s adaptive=%s motion=%d ble=%s target=%s:%d"
                  " temp=%.1f csi_count=%lu boots=%lu rssi_min=%d rssi_max=%d"
                  " csi_mode=%s hybrid_n=%d auth=%s flood_thresh=%d/%d powersave=%s"
-                 " presence=%s pr_score=%.4f chanscan=%s",
+                 " presence=%s pr_score=%.4f chanscan=%s"
+                 " nvs_used=%lu nvs_free=%lu nvs_total=%lu part_size=%lu",
                  uptime_str, (long long)up, (unsigned long)heap, rssi, channel, (int)s_tx_power_dbm,
                  s_send_frequency, actual_rate,
                  s_hostname, app_desc->version,
@@ -1542,7 +1560,11 @@ static int cmd_handle(const char *cmd, char *reply, size_t reply_size)
                  s_flood_thresh, s_flood_window_s,
                  s_powersave ? "on" : "off",
                  s_presence_enabled ? "on" : "off", s_pr_last_score,
-                 s_chanscan_enabled ? "on" : "off");
+                 s_chanscan_enabled ? "on" : "off",
+                 (unsigned long)nvs_stats.used_entries,
+                 (unsigned long)nvs_stats.free_entries,
+                 (unsigned long)nvs_stats.total_entries,
+                 (unsigned long)part_size);
         return strlen(reply);
     }