Refactor Docker setup and migration scripts

- Updated Dockerfile to set permissions for the entrypoint script and defined the entrypoint for the container.
- Consolidated Alembic migration history into a single initial migration file and removed obsolete revision files.
- Added a new script to run Alembic migrations before starting the application.
- Updated changelog to reflect changes in migration handling and Docker setup.
- Enhanced pytest configuration for coverage reporting and excluded specific files from coverage calculations.

main.py

@@ -4,7 +4,6 @@ from typing import Awaitable, Callable
 from fastapi import FastAPI, Request, Response
 from fastapi.staticfiles import StaticFiles
 
-from config.database import Base, engine
 from config.settings import get_settings
 from middleware.auth_session import AuthSessionMiddleware
 from middleware.validation import validate_json
@@ -24,9 +23,6 @@ from routes.scenarios import router as scenarios_router
 from monitoring import router as monitoring_router
 from services.bootstrap import bootstrap_admin, bootstrap_pricing_settings
 
-# Initialize database schema (imports above ensure models are registered)
-Base.metadata.create_all(bind=engine)
-
 app = FastAPI()
 
 app.add_middleware(AuthSessionMiddleware)