Switch to maven-dependency-plugin and adjust build output

Replaced `maven-shade-plugin` with `maven-dependency-plugin` for dependency management, simplifying the build process and separating runtime dependencies into a dedicated `lib/` directory. Updated `Dockerfile` and GitHub Actions config to account for these changes, ensuring all dependencies are correctly packaged and deployed.

.github/workflows/ci.yml

@@ -50,6 +50,7 @@ jobs:
           name: maven-artifacts
           path: |
             target/netneutrality.jar
+            target/lib
             startup.sh
           if-no-files-found: error