fix(obico): POST image bytes directly to ML API instead of callback URL (#1003)

The ML API previously called back into Bambuddy to fetch snapshots,
  which failed behind reverse proxies with external auth (Authelia, etc.).
  Now the detection loop captures the JPEG locally and POSTs it directly
  as multipart form data — no callback URL, no nonce cache, no
  external_url dependency.

frontend/src/api/client.ts

@@ -1868,7 +1868,6 @@ export interface ObicoStatus {
   sensitivity: 'low' | 'medium' | 'high';
   action: 'notify' | 'pause' | 'pause_and_off';
   poll_interval: number;
-  external_url_configured: boolean;
 }
 
 export interface ObicoTestConnection {