fix(spring): correctly parse and handle mirror node endpoint protocol (#111)

This PR addresses a bug in HieroAutoConfiguration.java where the default
port for the Mirror Node was being incorrectly assigned due to identity
comparison (==) on the protocol string.

- Replaced identity comparison with .equalsIgnoreCase() for robust protocol detection.
- Refactored port defaulting logic to explicitly handle http (80) and https (443).
- Implemented a fail-fast mechanism that throws an IllegalArgumentException for unsupported protocols.
- Removed redundant url.getPort() == -1 checks.

Signed-off-by: Aamir377300 <belalaamirkhan@gmail.com>

Author: Aamir377300

hiero-enterprise-spring/src/main/java/org/hiero/spring/implementation/HieroAutoConfiguration.java

@@ -138,12 +138,14 @@ MirrorNodeClient mirrorNodeClient(final HieroContext hieroContext) {
       final String mirrorNodeEndpointProtocol = url.getProtocol();
       final String mirrorNodeEndpointHost = url.getHost();
       final int mirrorNodeEndpointPort;
-      if (mirrorNodeEndpointProtocol == "https" && url.getPort() == -1) {
-        mirrorNodeEndpointPort = 443;
-      } else if (mirrorNodeEndpointProtocol == "http" && url.getPort() == -1) {
-        mirrorNodeEndpointPort = 80;
-      } else if (url.getPort() == -1) {
-        mirrorNodeEndpointPort = 443;
+      if (url.getPort() == -1) {
+        if ("http".equalsIgnoreCase(mirrorNodeEndpointProtocol)) {
+          mirrorNodeEndpointPort = 80;
+        } else if ("https".equalsIgnoreCase(mirrorNodeEndpointProtocol)) {
+          mirrorNodeEndpointPort = 443;
+        } else {
+          throw new IllegalArgumentException("Unsupported protocol: " + mirrorNodeEndpointProtocol);
+        }
       } else {
         mirrorNodeEndpointPort = url.getPort();
       }