Changes:
- Updated backend/src/services/mqtt.js to use LEGACY_API_USERNAME and LEGACY_API_PASSWORD from .env
- Updated services/api.ts with new robster credentials
- Added Legacy API and MQTT credentials to backend/.env.example
- MQTT service now falls back to LEGACY_API_* env vars if MQTT_* not set
This ensures all services use consistent, up-to-date credentials from environment configuration.
- setWiFi() now throws detailed errors instead of returning false
- Shows specific error messages: "WiFi credentials rejected", timeout etc.
- Added logging throughout BLE WiFi configuration flow
- Fixed WiFi network deduplication (keeps strongest signal)
- Ignore "Operation cancelled" error (normal cleanup behavior)
- BatchSetupProgress shows actual error in hint field
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Co-Authored-By: Claude <noreply@anthropic.com>