Design a Scalable Flask Blueprint Structure for Modular Applications

Design a complete Flask blueprint structure for a [APPLICATION_TYPE] application with the following modules: [MODULE_1], [MODULE_2], and [MODULE_3]. **Project Structure Requirements:** 1. **Directory Layout**: Generate the full folder tree showing: - Application factory pattern in `app/__init__.py` - Each blueprint in its own package under `app/[module]/` - Separate files for `routes.py`, `models.py`, `schemas.py`, and `services.py` within each blueprint - Shared utilities in `app/common/` (decorators, error handlers, middleware) - Configuration classes in `config.py` for [ENVIRONMENTS] (development, testing, production) 2. **Application Factory**: Implement `create_app(config_name)` that: - Loads environment-specific configuration - Initializes extensions (SQLAlchemy, Migrate, [ADDITIONAL_EXTENSIONS]) - Registers all blueprints with URL prefixes `/api/v1/[module]` - Sets up global error handlers returning JSON responses - Configures structured logging with [LOG_LEVEL] 3. **Blueprint Implementation**: For the [MODULE_1] blueprint, provide complete code for: - Blueprint registration with `url_prefix` - At least 3 routes: list (GET), create (POST), detail (GET /<id>) - A service layer class that encapsulates business logic separate from routes - Request validation using [VALIDATION_LIBRARY] (e.g., Marshmallow, Pydantic) 4. **Cross-Cutting Concerns**: - Authentication decorator using [AUTH_METHOD] - A `before_request` hook for request logging - Database session management and teardown 5. **Testing Setup**: Include a `conftest.py` with fixtures for the test client, database setup/teardown, and an authenticated user session. Provide every file with complete, runnable code and comments explaining architectural decisions.