Implement file hash-based library matching and remove fuzzy ASIN matching

Adds file hash-based matching for Audiobookshelf library items to ensure 100% accurate ASIN assignment for RMAB-organized content. Removes fuzzy matching from library availability checks, making all matching ASIN-only to eliminate false positives and race conditions. Updates database schema, processors, and matcher utilities; adds new tests and documentation for the new matching strategy. Removes obsolete scripts, Dockerfile, and related tests; updates docker-compose for test environments.

src/components/ui/Toast.tsx

@@ -192,14 +192,3 @@ function ToastItem({ toast, onRemove }: { toast: Toast; onRemove: (id: string) =
   );
 }
 
-/**
- * Confirmation Dialog Hook
- */
-export function useConfirm() {
-  return useCallback((message: string): Promise<boolean> => {
-    return new Promise((resolve) => {
-      const result = window.confirm(message);
-      resolve(result);
-    });
-  }, []);
-}