Improve Wi-Fi onboarding and BLE provisioning

[Funkelfetisch]

Summary

• add a generic BLE Provisioning Network child backed by Espressif network_provisioning
• enable BLE provisioning for native-radio WiFi ESP32 variants behind Kconfig and an sdkconfig fragment
• apply web/installer Wi-Fi credentials explicitly, delay connection attempts safely, and retry dropped STA connections before AP fallback
• surface provisioning and STA diagnostics while unsupported targets stay stubbed

Validation

• git diff --check origin/main..HEAD
• moondeck/check/check_specs.py
• moondeck/check/check_platform_boundary.py
• product-specific string scan on the PR diff
• moondeck/build/build_esp32.py --firmware esp32s3-n16r8
• esp32s3-n16r8 image: 0x1cd430, 55% app partition free

Not Run

• BLE provisioning from a real phone/client to an ESP32 device
• Desktop CMake/ctest: CMake is not available in this shell

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