docs: Update Bluetooth Low Energy API home page

docs/en/api-reference/bluetooth/bt_le.rst

@@ -1,8 +1,41 @@
-Bluetooth® Low Energy (Bluetooth LE)
+Bluetooth\ :sup:`®` Low Energy
 ====================================
 
+:link_to_translation:`zh_CN:[中文]`
+
+**Bluetooth Low Energy (Bluetooth LE)** provides low-power wireless communication for IoT devices such as wearables, sensors, and smart home products. This section documents the **Bluetooth LE API Reference**, covering APIs for device discovery, data exchange, and Wi-Fi provisioning over Bluetooth LE.
+
+For usage concepts and tutorials, see :doc:`Bluetooth Low Energy <../../../api-guides/ble/index>` in **API Guides**.
+
+The Bluetooth LE API in ESP-IDF is organized into the following parts:
+
+- :doc:`Bluetooth Low Energy GAP <esp_gap_ble>`
+
+  Handles advertising, scanning, connection management, and security operations
+
+- :doc:`Bluetooth Low Energy GATT Define <esp_gatt_defs>`
+
+  Common data types and constants for attributes, characteristics, and UUIDs used in GATT operations
+
+- :doc:`Bluetooth Low Energy GATT Server <esp_gatts>`
+
+  Exposes services and characteristics to remote clients (peripheral role)
+
+- :doc:`Bluetooth Low Energy GATT Client <esp_gattc>`
+
+  Discovers and accesses services on remote servers (central role)
+
+.. only:: SOC_BLUFI_SUPPORTED
+
+   - :doc:`Bluetooth Low Energy BluFi <esp_blufi>`
+
+     Enables Wi-Fi provisioning and configuration via Bluetooth LE
+
+Each part typically includes an **Overview**, **Application Examples**, and **API Reference**, covering purpose, main functionality, sample usage, and detailed API documentation.
+
 .. toctree::
-   :caption: Bluetooth Low Energy
+   :maxdepth: 1
+   :hidden:
 
    Bluetooth Low Energy GAP <esp_gap_ble>
    Bluetooth Low Energy GATT Define <esp_gatt_defs>