- Add HeartbeatHandler and enhance EchoHandler for Protocol Buffers support.

- Extend `test.proto` schema with heartbeat and echo message definitions.
- Register `HeartbeatHandler` in `DelegateActionManager`.
- Refactor Log4j2 configuration to standardize log levels.
- Optimize client wait time in `IPCManager` for reduced latency.

src/main/proto/test.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+option java_package = "com.mediamanager.protocol";
+option java_outer_classname = "TestProtocol";
+
+package mediamanager.test;
+
+message EchoCommand {
+  string message = 1;
+}
+
+message EchoResponse {
+  string message = 1;
+  int64 server_timestamp = 2;
+}
+
+message HeartbeatCommand {
+  int64 client_timestamp = 1;
+}
+
+message HeartbeatResponse {
+  int64 client_timestamp = 1;
+  int64 server_timestamp = 2;
+}