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.

Dockerfile

@@ -19,6 +19,7 @@ ARG API_PORT=9000
 EXPOSE ${API_PORT}
 
 COPY startup.sh ./
+COPY --from=build /build/target/lib ./lib
 COPY --from=build /build/target/netneutrality.jar ./
 
 RUN ["chmod", "+x", "./startup.sh"]