refact (core): simplifies constants.py, removes redundancy, updates dependent code

web/frontend/src/hooks/useFormatValidation.ts

@@ -16,7 +16,7 @@ export function useFormatValidation(
 ) {
   useEffect(() => {
     const selectedContainer = containers.find(c => c.name === options.container)
-    if (selectedContainer?.audio_only && hasVideo && !options.drop_video) {
+    if (!selectedContainer?.supports_video && hasVideo && !options.drop_video) {
       setFormatError(
         `Container '${options.container}' does not support video streams. Please enable "Drop video" or choose a container that supports video.`
       )

web/frontend/src/types/index.ts

@@ -48,7 +48,6 @@ export interface ContainerInfo {
   name: string
   ffmpeg: string
   extension: string
-  audio_only: boolean
   supports_video: boolean
   supports_subs: boolean
 }