Add all 23 GoF design pattern implementations (2026-06-13)

02-structural/bridge/Device.java

@@ -0,0 +1,17 @@
+package bridge;
+
+/**
+ * Implementor interface — the "implementation" side of the bridge.
+ * This is what the Abstraction delegates its real work to.
+ * TV, Radio, SmartSpeaker etc. all implement this.
+ */
+public interface Device {
+    boolean isEnabled();
+    void enable();
+    void disable();
+    int getVolume();
+    void setVolume(int percent);
+    int getChannel();
+    void setChannel(int channel);
+    String getName();
+}