refactor: expand BlockerEngine interface with Setup, List, Close methods and blocker info

internal/blocker/interface.go

@@ -1,6 +1,19 @@
 package blocker
 
+// BlockerEngine defines the interface for all firewall implementations
 type BlockerEngine interface {
+	// Core operations
 	Ban(ip string) error
 	Unban(ip string) error
+
+	// Lifecycle management
+	Setup() error
+	Close() error
+
+	// Query operations
+	List() ([]string, error)
+
+	// Metadata
+	Name() string
+	IsAvailable() bool
 }