Setup script references missing `.env.example` and missing scripts

[RonaldRonnie]

Description:

• scripts/setup.sh copies from .env.example, but the repository provides env.example (no leading dot). Setup will not create .env from the example.
• setup.sh tells users to run ./scripts/start.sh, ./scripts/stop.sh, ./scripts/restart.sh, but these scripts do not exist in the repo.

Acceptance criteria:

• Either rename env.example to .env.example or update setup.sh to copy env.example to .env
• Add scripts/start.sh, scripts/stop.sh, and (optionally) scripts/restart.sh, or update setup instructions to use existing scripts (e.g. mvn spring-boot:run, deploy.sh)