support esp launchpad online download

images/cfg.md

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+#### Build Config
+- esp-idf: V5.3
+- 小智开源: [V0.9.7](https://github.com/78/xiaozhi-esp32/tree/v0.9.7)

images/config.toml

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+esp_toml_version = 1.0
+firmware_images_url = "https://github.com/whble/xiaozhi-esp32/blob/main/images/"
+config_readme_url = "https://github.com/whble/xiaozhi-esp32/blob/main/images/cfg.md"
+
+supported_apps = ["xiaozhi_esp-box-3_v0.9.8"]
+
+[xiaozhi_esp-box-3_v0.9.8]
+chipsets = ["ESP32S3"]
+image.esp32s3 = "xiaozhi_esp-box-3_v0.9.8.bin"
+ios_app_url = ""
+android_app_url = ""
+readme.text = "https://github.com/78/xiaozhi-esp32/blob/main/README.md"
+