Docs: update according to changes in the new versions

web-panel.md:
- Replace Start OTA nav item with dedicated Firmware Update section
- Update Info panel: Version/Client Version → Hardware/Firmware
- Add auto-refresh toggle to /stats element list
- Expand Trends list: add error_rate, core0_util, mcu_temp,
  note RX/TX stacked rendering of packets series
- Update sequential trend loading order accordingly
- Rewrite OTA subsection to describe native HTTPS upload flow

api.md:
- Add error_rate and core0_util to supported series list

boards.md:
- Add DIY_ESP32S3_N16R8_E22_Back2back to repeater_mqtt table

local-builds.md:
- Add DIY_ESP32S3_N16R8_E22_Back2back_repeater_mqtt
- Add Ebyte_EoRa-S3_Repeater_mqtt
- Add ThinkNode_M2_Repeater_mqtt
- Add ThinkNode_M5_Repeater_mqtt

docs/boards.md

@@ -84,6 +84,7 @@
 
 | Устройство               | Микроконтроллер | ОЗУ    | PSRAM | Флеш   | LoRa   | Дисплей          | GPS | SD  |
 | ------------------------ | --------------- | ------ | ----- | ------ | ------ | ---------------- | --- | --- |
+| DIY_ESP32S3_N16R8_E22_Back2back  | ESP32S3 | 512 Кб | 8 Мб  | 16 Мб  | SX1262 | Нет              |     |     |
 | Ebyte_EoRa-S3            | ESP32S3         | 512 Кб | 2 Мб  | 4 Мб   | SX1262 | OLED (SSD1306)   |     |     |
 | Generic_E22_sx1262       | ESP32           | 520 Кб | Нет   | 4 Мб   | SX1262 | Нет              |     |     |
 | Generic_E22_sx1268       | ESP32           | 520 Кб | Нет   | 4 Мб   | SX1268 | Нет              |     |     |