Refactor Docker entrypoints and remove unused scripts

- Removed custom entrypoint scripts for backend, frontend, and PostgreSQL services from docker-compose files.
- Added a new entrypoint script in the backend and frontend Dockerfiles to handle initialization without relying on host-mounted scripts.
- Updated Dockerfiles to ensure proper permissions for the new entrypoint scripts.
- Enhanced database initialization logic by moving schema and extension creation to the Alembic migration script.

docker-compose.prod.yml

@@ -12,7 +12,6 @@ services:
       - "5939:5432"
     volumes:
       - postgres_app_data:/var/lib/postgresql/data
-      - ./scripts/postgres-app-entrypoint.sh:/docker-entrypoint-initdb.d/init-app.sh:ro
     networks:
       - backend-net
     restart: unless-stopped
@@ -48,7 +47,6 @@ services:
       - "5233:5432"
     volumes:
       - postgres_keycloak_data:/var/lib/postgresql/data
-      - ./scripts/postgres-keycloak-entrypoint.sh:/docker-entrypoint-initdb.d/init-keycloak.sh:ro
     networks:
       - auth-net
       - backend-net
@@ -201,12 +199,10 @@ services:
     volumes:
       - backend_uploads:/app/uploads
       - backend_layouts:/app/layouts
-      - ./scripts/backend-entrypoint.sh:/entrypoint.sh:ro
     networks:
       - backend-net
       - frontend-net
     restart: unless-stopped
-    entrypoint: [ "/entrypoint.sh" ]
     command: [ "gunicorn", "main:app", "-k", "uvicorn.workers.UvicornWorker", "-w", "${WEB_CONCURRENCY:-1}", "-b", "0.0.0.0:8000", "--log-level", "info", "--forwarded-allow-ips", "*" ]
     healthcheck:
       test: [ "CMD-SHELL", "curl -f http://localhost:8000/api/health || exit 1" ]
@@ -354,9 +350,6 @@ services:
     depends_on:
       backend:
         condition: service_healthy
-    entrypoint: [ "/frontend-entrypoint.sh" ]
-    volumes:
-      - ./scripts/frontend-entrypoint.sh:/frontend-entrypoint.sh:ro
     networks:
       - frontend-net
       - backend-net