fix: Resolve mvn command not found error in CI workflow

- Replace 'mvn' commands with './mvnw' in CI workflow
- Add chmod +x ./mvnw step to make Maven wrapper executable
- Add cache: maven to Java setup step for better caching
- Update troubleshooting scripts to use correct port 40047
- Update documentation to reflect port change

This fixes the 'mvn: command not found' error by ensuring
all Maven commands use the Maven wrapper (mvnw) which is
included in the project and doesn't require Maven to be
pre-installed on the runner.

runners/fix-cache-issues.sh

@@ -104,8 +104,8 @@ fix_cache_issues() {
     HOST_IP=$(detect_host_ip)
     
     # Set proper environment variables
-    export ACTIONS_CACHE_URL="http://${HOST_IP}:44029/"
-    export ACTIONS_RUNTIME_URL="http://${HOST_IP}:44029/"
+    export ACTIONS_CACHE_URL="http://${HOST_IP}:40047/"
+    export ACTIONS_RUNTIME_URL="http://${HOST_IP}:40047/"
     
     echo "✅ Cache directory created and configured"
     echo "✅ Environment variables set with host IP: $HOST_IP"
@@ -154,7 +154,7 @@ test_cache() {
     
     # Try to restore (this will fail but we can check the error)
     echo "   Testing cache restore..."
-    if curl -s "http://host.docker.internal:44029/cache/$TEST_KEY" > /dev/null 2>&1; then
+    if curl -s "http://${HOST_IP}:40047/cache/$TEST_KEY" > /dev/null 2>&1; then
         echo "✅ Cache service responding"
     else
         echo "❌ Cache service not responding"