GET /health
Response: {"ok":true,"knowledge_count":120,"uptime_s":3600}

POST /chat
Body: {"message":"Hello","username":"user","topic":"general"}
Response: {"reply":"Hi!","topic":"general","confidence":0.99}

POST /add
Body: {"text":"Q","topic":"general","reply":"A"}
Response: {"status":"✅ Knowledge added"}

POST /speak_json
Body: {"text":"Hello","language":"en","voice_wav_b64":"..."}
Response: Audio WAV file

POST /image_edit_json
Body: {"image_b64":"...","operations":[{"op":"resize","width":800}]}
Ops: resize, rotate, crop, blur, grayscale, overlay_text

POST /coder/run
Body: {"code":"print('hi')","language":"python","timeout":15}
Response: {"stdout":"hi\n","stderr":"","return_code":0}

POST /video/generate
Body: {"prompt":"sunset","num_frames":16,"fps":8}
Response: {"video_url":"/videos/abc.mp4","status":"completed"}