ax(mining): rename opts/opt to options/option in NewFileRepository

AX Principle 1: predictable names over short names.
`opts` and `opt` are abbreviations — `options` and `option` are unambiguous.

Co-Authored-By: Charon <charon@lethean.io>

pkg/mining/repository.go

@@ -39,13 +39,13 @@ func WithDefaults[T any](fn func() T) FileRepositoryOption[T] {
 	}
 }
 
-// NewFileRepository creates a new file-based repository.
-func NewFileRepository[T any](path string, opts ...FileRepositoryOption[T]) *FileRepository[T] {
+// repo := NewFileRepository[MinersConfig](path, WithDefaults(defaultMinersConfig))
+func NewFileRepository[T any](path string, options ...FileRepositoryOption[T]) *FileRepository[T] {
 	r := &FileRepository[T]{
 		path: path,
 	}
-	for _, opt := range opts {
-		opt(r)
+	for _, option := range options {
+		option(r)
 	}
 	return r
 }