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maziggy
abc8e97050
go2rtc and several IP cameras still emit a warm-up / black frame on every fresh MJPEG connection — even with the v0.2.4b2 warm-up-skip fix it slipped through intermittently for @nkm8's setup. His own bisect named the clean solution: go2rtc exposes /api/frame.jpeg as a dedicated single-frame endpoint that never returns the encoder's stale keyframe. Adds an optional external_camera_snapshot_url column on printers. When set, every single-frame capture path (snapshot endpoint, [SNAPSHOT] notification thumbnails, [PHOTO-BG] finish photo, layer timelapse, Obico ML, plate-detect / calibrate-plate) routes through _capture_snapshot on the override URL via plain HTTP GET, bypassing the warm-up dance. Live view stays on the configured stream URL — only single-frame captures use the override. Override is camera-type-agnostic. SSRF guard applies (existing _sanitize_camera_url allowlist). Empty string treated as unset. Settings UI: new "Snapshot URL (optional)" input + Test button under External Cameras, hidden for camera_type=snapshot since the live URL is already a single-frame source. en + de fully translated; 6 other locales seeded with English copy. 5 backend tests pin the routing contract; 3 frontend tests pin the input + debounced PATCH. Documented in bambuddy-wiki/docs/features/camera.md with the go2rtc example.