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

web/backend/api/info.py

@@ -9,7 +9,7 @@ from backend.services.task_manager import task_manager
 # Import core functions
 from audio_splitter.ffmpeg import get_stream_info, get_container_format, get_audio_codec
 from audio_splitter.formats import determine_default_format
-from audio_splitter.constants import FORMAT_INFO
+from audio_splitter.constants import CONTAINER_NAMES
 from audio_splitter.defaults import DEFAULT_FORMAT
 
 router = APIRouter(prefix="/api", tags=["info"])
@@ -63,7 +63,7 @@ async def get_recommended_format(task_id: str):
         # Fallback if detection fails or format is unsupported
         if fmt is None:
             fmt = DEFAULT_FORMAT
-        if fmt not in FORMAT_INFO:
+        if fmt not in CONTAINER_NAMES:
             fmt = "mp3"  # ultimate fallback
 
         return {"format": fmt}

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
 }