fix speaker volume control and auth

- Rename USERNAME/PASSWORD to UNIFI_USERNAME/UNIFI_PASSWORD to avoid
  conflict with the Windows USERNAME system environment variable
- Set both speakerSettings.volume and speakerSettings.speakerVolume
  in the PATCH request
- Log volume before and after the change to verify it took effect

dump_camera.py

@@ -0,0 +1,29 @@
+import json
+import os
+
+import httpx
+from dotenv import load_dotenv
+
+load_dotenv()
+
+BASE = f"https://{os.environ['HOST']}/proxy/protect/integration/v1"
+HEADERS = {"X-API-Key": os.environ["API_KEY"]}
+CAMERA_NAME = "G6 Pro 360"
+
+
+def main():
+    with httpx.Client(headers=HEADERS, verify=False) as client:
+        cameras = client.get(f"{BASE}/cameras").raise_for_status().json()
+        camera = next(c for c in cameras if CAMERA_NAME in c["name"])
+
+        print("=== Camera ===")
+        data = client.get(f"{BASE}/cameras/{camera['id']}").raise_for_status().json()
+        print(json.dumps(data, indent=2))
+
+        print("\n=== Sensors ===")
+        sensors = client.get(f"{BASE}/sensors").raise_for_status().json()
+        print(json.dumps(sensors, indent=2))
+
+
+if __name__ == "__main__":
+    main()