config cleanup

src/README.md

@@ -200,19 +200,22 @@ Currently consumed fields:
 - `oscBindAddress` (reported for compatibility; OSC ingress is not wired yet)
 - `oscPort` (reported for compatibility; OSC ingress is not wired yet)
 - `oscSmoothing` (reported for compatibility; OSC ingress is not wired yet)
-- `inputVideoFormat`
-- `inputFrameRate`
-- `outputVideoFormat`
-- `outputFrameRate`
-- `videoInputBackend`
-- `videoOutputBackend`
+- `input.backend`
+- `input.device`
+- `input.resolution`
+- `input.frameRate`
+- `output.backend`
+- `output.device`
+- `output.resolution`
+- `output.frameRate`
+- `output.keying.external`
+- `output.keying.alphaRequired`
 - `autoReload`
 - `maxTemporalHistoryFrames`
 - `previewEnabled`
 - `previewFps`
-- `enableExternalKeying`
 
-`videoInputBackend` and `videoOutputBackend` currently support `decklink` and `none`. Backend creation is routed through the app-side video backend factory, so new concrete backends can be added without making `main` or the render cadence path own their startup details.
+`input.backend` and `output.backend` currently support `decklink` and `none`. Backend creation is routed through the app-side video backend factory, so new concrete backends can be added without making `main` or the render cadence path own their startup details.
 
 When `previewEnabled` is true, the preview window runs on `PreviewWindowThread`. It paints BGRA8 system-memory frames with Win32/GDI after render readback has already completed, so it does not bind GL and does not consume frames from DeckLink output. `previewFps` controls the preview repaint cadence; the default is 60 fps and `config/runtime-host.json` tracks the shipped 59.94 output cadence.