fix(nimble): Improve safety, fix bugs, and update docs across NimBLE examples

- Remove unused headers from examples
- Improve periodic adv/sync example functionality and readability
- Use ble_hs_id_infer_auto() instead of hardcoded BLE_OWN_ADDR_PUBLIC/RANDOM
- Add ble_hs_util_ensure_addr() calls in on_sync for proper address setup
- Use correct ext adv instance (0 instead of 1) in phy_prph, l2cap_coc, multi_conn
- Fix struct name: ble_gap_periodic_adv_enable_params -> ble_gap_periodic_adv_start_params
- Add CONFIG_BT_NIMBLE_GAP_SERVICE guards around ble_svc_gap_device_name_set
- Fix unsafe AD data parsing with bounds checks in central examples
- Fix UUID matching bugs (off-by-one loop condition and byte order) in
  phy_cent, htp_cent, and proximity_sensor_cent
- Fix ble_multi_conn_cent address type to use dynamic inference
- Remove contradictory sm_sc=0 after sm_sc=1 in ble_multi_adv
- Add CONFIG_BT_NIMBLE_EXT_ADV=y to ble_multi_adv sdkconfig defaults
- Check return values for ble_gap_set_host_feat, nimble_port_init
- Update tutorials and READMEs to match code changes

examples/bluetooth/nimble/common/nimble_central_utils/misc.c

@@ -1,15 +1,10 @@
 /*
- * SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
 
-#include <assert.h>
-#include <stdio.h>
-#include <string.h>
 #include "host/ble_hs.h"
-#include "host/ble_uuid.h"
-#include "esp_central.h"
 
 /**
  * Utility function to log an array of bytes.

examples/bluetooth/nimble/common/nimble_central_utils/peer.c

@@ -4,8 +4,6 @@
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
 
-#include <assert.h>
-#include <string.h>
 #include "host/ble_hs.h"
 #include "esp_central.h"