{"status":"ok","message":"SmartClassroom API v0.7.0 running (Groq powered)","routes":{"POST /uploadfile/":"Manual WAV upload","POST /uploadraw/":"ESP32 single PCM blob","POST /uploadchunk/":"ESP32 chunked PCM","POST /debug_audio/":"Audio amplitude check","GET  /lectures/":"All lectures","GET  /lectures/{id}":"Single lecture","PATCH  /lectures/{id}":"Edit lecture","DELETE /lectures/{id}":"Delete lecture"}}