Change repo structure and improve logging

.gitmodules

evoprompt/api/__init__.py

evoprompt/api/backend.py

evoprompt/api/config.py

evoprompt/api/main.py

evoprompt/api/routers/__init__.py

evoprompt/api/routers/optimization.py

evoprompt/api/routers/runs.py

evoprompt/cli.py

evoprompt/evolution.py

evoprompt/frontend

evoprompt/models.py

evoprompt/opt_types.py

evoprompt/optimization.py

evoprompt/task.py

evoprompt/utils.py

frontend

main.py