- Updated Gradle version in `.env`, Dockerfiles, and wrapper to 9.3.1.
- Replaced alias-based application of `kotlinMultiplatform` plugin with direct `id` usage in subprojects to resolve "Plugin loaded multiple times" error.
- Applied centralized plugin management and Gradle daemon optimizations to improve Docker build stability and address KMP classloading issues.
- Reorganized `docker-compose.yaml` by splitting it into modular files: `dc-infra.yaml`, `dc-backend.yaml`, `dc-gui.yaml`, and `dc-ops.yaml`.
- Simplified structure by removing redundant `docker-compose.frontend.yaml` and `docker-compose.services.yaml` files.
- Improved maintainability and modularity of service definitions across infrastructure, backend, GUI, and ops layers.