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.yml

@@ -12,7 +12,6 @@ services:
       - "5432:5432"
     volumes:
       - postgres_app_data:/var/lib/postgresql
-      - ./scripts/postgres-app-entrypoint.sh:/docker-entrypoint-initdb.d/init-app.sh:ro
     networks:
       - backend-net
     restart: unless-stopped
@@ -48,7 +47,6 @@ services:
       - "5433:5432"
     volumes:
       - postgres_keycloak_data:/var/lib/postgresql
-      - ./scripts/postgres-keycloak-entrypoint.sh:/docker-entrypoint-initdb.d/init-keycloak.sh:ro
     networks:
       - auth-net
       - backend-net
@@ -206,12 +204,10 @@ services:
       - ./backend:/app
       - backend_cache:/app/__pycache__
       - backend_uploads:/app/uploads
-      - ./scripts/backend-entrypoint.sh:/entrypoint.sh:ro
     networks:
       - backend-net
       - frontend-net
     restart: unless-stopped
-    entrypoint: [ "/entrypoint.sh" ]
     command: [ "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--reload", "--log-level", "info" ]
     healthcheck:
       test: [ "CMD-SHELL", "curl -f http://localhost:8000/api/health || exit 1" ]
@@ -257,11 +253,9 @@ services:
     depends_on:
       backend:
         condition: service_healthy
-    entrypoint: [ "/frontend-entrypoint.sh" ]
     volumes:
       - ./frontend:/app
       - frontend_node_modules:/app/node_modules
-      - ./scripts/frontend-entrypoint.sh:/frontend-entrypoint.sh:ro
     networks:
       - frontend-net
       - auth-net