fix: isolate movie and TV webhook processing to prevent cross-contamination

- Add prefixed batch keys (movie:imdbid, tv:imdbid) to prevent IMDb ID collisions
- Add path existence validation for Radarr webhooks to reject invalid mappings early
- Remove duplicate Radarr webhook handler code
- Add debug scripts for troubleshooting webhook and path mapping issues
- Create corrected .env template with fixed TV_PATHS and SONARR_ROOT_FOLDERS

This fixes the issue where TV path mapping failures caused movie webhooks
to process wrong movies due to shared batch queue corruption.

core/path_mapper.py

@@ -123,6 +123,12 @@ class PathMapper:
                 relative_path = radarr_path[len(radarr_root):].lstrip("/")
                 container_path = f"{container_root.rstrip('/')}/{relative_path}" if relative_path else container_root.rstrip("/")
                 _log("DEBUG", f"Mapped Radarr path {radarr_path} -> {container_path}")
+                
+                # Check if the mapped path actually exists
+                from pathlib import Path
+                if not Path(container_path).exists():
+                    _log("WARNING", f"Mapped container path does not exist: {container_path}")
+                
                 return container_path
         
         _log("WARNING", f"No container mapping found for Radarr path: {radarr_path}")